Fix: correctly scope mail account enumeration (#12636)

* Changelog v2.20.14 - GHA

* Reorganize

---------

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

docs/advanced_usage.md

@@ -761,7 +761,7 @@ MariaDB: `mariadb-tzinfo-to-sql /usr/share/zoneinfo | mariadb -u root mysql -p`
 
 ## Barcodes {#barcodes}
 
-Paperless is able to utilize barcodes for automatically performing some tasks.
+Paperless is able to utilize barcodes for automatically performing some tasks. Barcodes are only supported for PDF documents or TIFF, [if enabled](configuration.md#PAPERLESS_CONSUMER_BARCODE_TIFF_SUPPORT).
 
 At this time, the library utilized for detection of barcodes supports the following types:
 

docs/changelog.md

@@ -1,5 +1,67 @@
 # Changelog
 
+## paperless-ngx 2.20.14
+
+### Bug Fixes
+
+-   Fix: do not submit permissions for non-owners [@shamoon](https://github.com/shamoon) ([#12571](https://github.com/paperless-ngx/paperless-ngx/pull/12571))
+-   Fix: prevent duplicate parent tag IDs [@shamoon](https://github.com/shamoon) ([#12522](https://github.com/paperless-ngx/paperless-ngx/pull/12522))
+-   Fix: dont defer tag change application in workflows [@shamoon](https://github.com/shamoon) ([#12478](https://github.com/paperless-ngx/paperless-ngx/pull/12478))
+-   Fix: limit share link viewset actions [@shamoon](https://github.com/shamoon) ([#12461](https://github.com/paperless-ngx/paperless-ngx/pull/12461))
+-   Fix: add fallback ordering for documents by id after created [@shamoon](https://github.com/shamoon) ([#12440](https://github.com/paperless-ngx/paperless-ngx/pull/12440))
+-   Fixhancement: default mail-created correspondent matching to exact [@shamoon](https://github.com/shamoon) ([#12414](https://github.com/paperless-ngx/paperless-ngx/pull/12414))
+-   Fix: validate date CF value in serializer [@shamoon](https://github.com/shamoon) ([#12410](https://github.com/paperless-ngx/paperless-ngx/pull/12410))
+
+### All App Changes
+
+<details>
+<summary>7 changes</summary>
+
+-   Fix: do not submit permissions for non-owners [@shamoon](https://github.com/shamoon) ([#12571](https://github.com/paperless-ngx/paperless-ngx/pull/12571))
+-   Fix: prevent duplicate parent tag IDs [@shamoon](https://github.com/shamoon) ([#12522](https://github.com/paperless-ngx/paperless-ngx/pull/12522))
+-   Fix: dont defer tag change application in workflows [@shamoon](https://github.com/shamoon) ([#12478](https://github.com/paperless-ngx/paperless-ngx/pull/12478))
+-   Fix: limit share link viewset actions [@shamoon](https://github.com/shamoon) ([#12461](https://github.com/paperless-ngx/paperless-ngx/pull/12461))
+-   Fix: add fallback ordering for documents by id after created [@shamoon](https://github.com/shamoon) ([#12440](https://github.com/paperless-ngx/paperless-ngx/pull/12440))
+-   Fixhancement: default mail-created correspondent matching to exact [@shamoon](https://github.com/shamoon) ([#12414](https://github.com/paperless-ngx/paperless-ngx/pull/12414))
+-   Fix: validate date CF value in serializer [@shamoon](https://github.com/shamoon) ([#12410](https://github.com/paperless-ngx/paperless-ngx/pull/12410))
+</details>
+
+## paperless-ngx 2.20.13
+
+### Bug Fixes
+
+-   Fix: suggest corrections only if visible results
+-   Fix: require view permission for more-like search
+-   Fix: validate document link targets
+-   Fix: enforce permissions when attaching accounts to mail rules
+
+## paperless-ngx 2.20.12
+
+### Security
+
+-   Resolve [GHSA-96jx-fj7m-qh6x](https://github.com/paperless-ngx/paperless-ngx/security/advisories/GHSA-96jx-fj7m-qh6x)
+
+### Bug Fixes
+
+-   Fix: Scope the workflow saves to prevent clobbering filename/archive_filename [@stumpylog](https://github.com/stumpylog) ([#12390](https://github.com/paperless-ngx/paperless-ngx/pull/12390))
+-   Fix: don't try to usermod/groupmod when non-root + update docs (#<!---->12365) [@stumpylog](https://github.com/stumpylog) ([#12391](https://github.com/paperless-ngx/paperless-ngx/pull/12391))
+-   Fix: avoid moving files if already moved [@shamoon](https://github.com/shamoon) ([#12389](https://github.com/paperless-ngx/paperless-ngx/pull/12389))
+-   Fix: remove pagination from document notes api spec [@shamoon](https://github.com/shamoon) ([#12388](https://github.com/paperless-ngx/paperless-ngx/pull/12388))
+-   Fix: fix file button hover color in dark mode [@shamoon](https://github.com/shamoon) ([#12367](https://github.com/paperless-ngx/paperless-ngx/pull/12367))
+-   Fixhancement: only offer basic auth for appropriate requests [@shamoon](https://github.com/shamoon) ([#12362](https://github.com/paperless-ngx/paperless-ngx/pull/12362))
+
+### All App Changes
+
+<details>
+<summary>5 changes</summary>
+
+-   Fix: Scope the workflow saves to prevent clobbering filename/archive_filename [@stumpylog](https://github.com/stumpylog) ([#12390](https://github.com/paperless-ngx/paperless-ngx/pull/12390))
+-   Fix: avoid moving files if already moved [@shamoon](https://github.com/shamoon) ([#12389](https://github.com/paperless-ngx/paperless-ngx/pull/12389))
+-   Fix: remove pagination from document notes api spec [@shamoon](https://github.com/shamoon) ([#12388](https://github.com/paperless-ngx/paperless-ngx/pull/12388))
+-   Fix: fix file button hover color in dark mode [@shamoon](https://github.com/shamoon) ([#12367](https://github.com/paperless-ngx/paperless-ngx/pull/12367))
+-   Fixhancement: only offer basic auth for appropriate requests [@shamoon](https://github.com/shamoon) ([#12362](https://github.com/paperless-ngx/paperless-ngx/pull/12362))
+</details>
+
 ## paperless-ngx 2.20.11
 
 ### Security

docs/usage.md

@@ -381,7 +381,7 @@ still have "object-level" permissions.
 | StoragePath   | Add, edit, delete or view Storage Paths.                                                                                                                                                                                        |
 | Tag           | Add, edit, delete or view Tags.                                                                                                                                                                                                 |
 | UISettings    | Add, edit, delete or view the UI settings that are used by the web app.<br/>:warning: **Users that will access the web UI must be granted at least _View_ permissions.**                                                        |
-| User          | Add, edit, delete or view Users.                                                                                                                                                                                                |
+| User          | Add, edit, delete or view other user accounts via Settings > Users & Groups and `/api/users/`. These permissions are not needed for users to edit their own profile via "My Profile" or `/api/profile/`.                        |
 | Workflow      | Add, edit, delete or view Workflows.<br/>Note that Workflows are global; all users who can access workflows see the same set. Workflows have other permission implications — see [Workflow permissions](#workflow-permissions). |
 
 #### Detailed Explanation of Object Permissions {#object-permissions}
@@ -392,6 +392,8 @@ still have "object-level" permissions.
 | View  | Confers the ability to view (not edit) a document, tag, etc.<br/>Users without 'view' (or higher) permissions will be shown _'Private'_ in place of the object name for example when viewing a document with a tag for which the user doesn't have permissions.                                                                          |
 | Edit  | Confers the ability to edit (and view) a document, tag, etc.                                                                                                                                                                                                                                                                             |
 
+For related metadata such as tags, correspondents, document types, and storage paths, object visibility and document assignment are intentionally distinct. A user may still retain or submit a known object ID when editing a document even if that related object is displayed as _Private_ or omitted from search and selection results. This allows documents to preserve existing assignments that the current user cannot necessarily inspect in detail.
+
 ### Password reset
 
 In order to enable the password reset feature you will need to setup an SMTP backend, see

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "paperless-ngx"
-version = "2.20.12"
+version = "2.20.14"
 description = "A community-supported supercharged document management system: scan, index and archive all your physical documents"
 readme = "README.md"
 requires-python = ">=3.10"

src-ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "paperless-ngx-ui",
-  "version": "2.20.12",
+  "version": "2.20.14",
   "scripts": {
     "preinstall": "npx only-allow pnpm",
     "ng": "ng",

src-ui/src/app/components/common/edit-dialog/edit-dialog.component.spec.ts

@@ -26,6 +26,7 @@ import {
 } from 'src/app/data/matching-model'
 import { Tag } from 'src/app/data/tag'
 import { SETTINGS_KEYS } from 'src/app/data/ui-settings'
+import { PermissionsService } from 'src/app/services/permissions.service'
 import { TagService } from 'src/app/services/rest/tag.service'
 import { UserService } from 'src/app/services/rest/user.service'
 import { SettingsService } from 'src/app/services/settings.service'
@@ -87,6 +88,7 @@ describe('EditDialogComponent', () => {
   let component: TestComponent
   let fixture: ComponentFixture<TestComponent>
   let tagService: TagService
+  let permissionsService: PermissionsService
   let settingsService: SettingsService
   let activeModal: NgbActiveModal
   let httpTestingController: HttpTestingController
@@ -118,8 +120,10 @@ describe('EditDialogComponent', () => {
     }).compileComponents()
 
     tagService = TestBed.inject(TagService)
+    permissionsService = TestBed.inject(PermissionsService)
     settingsService = TestBed.inject(SettingsService)
     settingsService.currentUser = currentUser
+    permissionsService.initialize([], currentUser as any)
     activeModal = TestBed.inject(NgbActiveModal)
     httpTestingController = TestBed.inject(HttpTestingController)
 
@@ -226,6 +230,25 @@ describe('EditDialogComponent', () => {
     expect(updateSpy).toHaveBeenCalled()
   })
 
+  it('should not submit owner or permissions for non-owner edits', () => {
+    component.object = tag
+    component.dialogMode = EditDialogMode.EDIT
+    component.ngOnInit()
+
+    component.objectForm.get('name').setValue('Updated tag')
+    component.save()
+
+    const req = httpTestingController.expectOne(
+      `${environment.apiBaseUrl}tags/${tag.id}/`
+    )
+    expect(req.request.method).toEqual('PUT')
+    expect(req.request.body.name).toEqual('Updated tag')
+    expect(req.request.body.owner).toEqual(tag.owner)
+    expect(req.request.body.set_permissions).toBeUndefined()
+
+    req.flush({})
+  })
+
   it('should create an object on save in edit mode', () => {
     const createSpy = jest.spyOn(tagService, 'create')
     component.dialogMode = EditDialogMode.CREATE

src-ui/src/app/components/common/edit-dialog/edit-dialog.component.ts

@@ -18,6 +18,7 @@ import { ObjectWithId } from 'src/app/data/object-with-id'
 import { ObjectWithPermissions } from 'src/app/data/object-with-permissions'
 import { SETTINGS_KEYS } from 'src/app/data/ui-settings'
 import { User } from 'src/app/data/user'
+import { PermissionsService } from 'src/app/services/permissions.service'
 import { AbstractPaperlessService } from 'src/app/services/rest/abstract-paperless-service'
 import { UserService } from 'src/app/services/rest/user.service'
 import { SettingsService } from 'src/app/services/settings.service'
@@ -42,6 +43,7 @@ export abstract class EditDialogComponent<
   protected activeModal = inject(NgbActiveModal)
   protected userService = inject(UserService)
   protected settingsService = inject(SettingsService)
+  protected permissionsService = inject(PermissionsService)
 
   users: User[]
 
@@ -69,10 +71,6 @@ export abstract class EditDialogComponent<
 
   ngOnInit(): void {
     if (this.object != null && this.dialogMode !== EditDialogMode.CREATE) {
-      if ((this.object as ObjectWithPermissions).permissions) {
-        this.object['set_permissions'] = this.object['permissions']
-      }
-
       this.object['permissions_form'] = {
         owner: (this.object as ObjectWithPermissions).owner,
         set_permissions: (this.object as ObjectWithPermissions).permissions,
@@ -151,18 +149,28 @@ export abstract class EditDialogComponent<
     return Object.assign({}, this.objectForm.value)
   }
 
+  protected shouldSubmitPermissions(): boolean {
+    return (
+      this.dialogMode === EditDialogMode.CREATE ||
+      this.permissionsService.currentUserOwnsObject(this.object)
+    )
+  }
+
   save() {
     this.error = null
     const formValues = this.getFormValues()
     const permissionsObject: PermissionsFormObject =
       this.objectForm.get('permissions_form')?.value
-    if (permissionsObject) {
+    if (permissionsObject && this.shouldSubmitPermissions()) {
       formValues.owner = permissionsObject.owner
       formValues.set_permissions = permissionsObject.set_permissions
-      delete formValues.permissions_form
     }
+    delete formValues.permissions_form
 
     var newObject = Object.assign(Object.assign({}, this.object), formValues)
+    if (!this.shouldSubmitPermissions()) {
+      delete newObject['set_permissions']
+    }
     var serverResponse: Observable<T>
     switch (this.dialogMode) {
       case EditDialogMode.CREATE:

src-ui/src/app/components/common/edit-dialog/user-edit-dialog/user-edit-dialog.component.ts

@@ -9,7 +9,6 @@ import { first } from 'rxjs'
 import { EditDialogComponent } from 'src/app/components/common/edit-dialog/edit-dialog.component'
 import { Group } from 'src/app/data/group'
 import { User } from 'src/app/data/user'
-import { PermissionsService } from 'src/app/services/permissions.service'
 import { GroupService } from 'src/app/services/rest/group.service'
 import { UserService } from 'src/app/services/rest/user.service'
 import { SettingsService } from 'src/app/services/settings.service'
@@ -39,7 +38,6 @@ export class UserEditDialogComponent
   implements OnInit
 {
   private toastService = inject(ToastService)
-  private permissionsService = inject(PermissionsService)
   private groupsService: GroupService
 
   groups: Group[]

src-ui/src/app/components/common/input/tags/tags.component.spec.ts

@@ -205,6 +205,20 @@ describe('TagsComponent', () => {
     expect(component.value).toEqual([2, 1])
   })
 
+  it('should not duplicate parents when adding sibling nested tags', () => {
+    const root: Tag = { id: 1, name: 'root' }
+    const parent: Tag = { id: 2, name: 'parent', parent: 1 }
+    const leafA: Tag = { id: 3, name: 'leaf-a', parent: 2 }
+    const leafB: Tag = { id: 4, name: 'leaf-b', parent: 2 }
+    component.tags = [root, parent, leafA, leafB]
+
+    component.value = []
+    component.addTag(3)
+    component.addTag(4)
+
+    expect(component.value).toEqual([3, 2, 1, 4])
+  })
+
   it('should return ancestors from root to parent using getParentChain', () => {
     const root: Tag = { id: 1, name: 'root' }
     const mid: Tag = { id: 2, name: 'mid', parent: 1 }

src-ui/src/app/components/common/input/tags/tags.component.ts

@@ -153,11 +153,13 @@ export class TagsComponent implements OnInit, ControlValueAccessor {
   }
 
   public onAdd(tag: Tag) {
-    if (tag.parent) {
+    if (tag?.parent) {
       // add all parents recursively
       const parent = this.getTag(tag.parent)
-      this.value = [...this.value, parent.id]
+      if (parent && !this.value.includes(parent.id)) {
-      this.onAdd(parent)
+        this.value = [...this.value, parent.id]
+        this.onAdd(parent)
+      }
     }
   }
 

src-ui/src/environments/environment.prod.ts

@@ -6,7 +6,7 @@ export const environment = {
   apiVersion: '9', // match src/paperless/settings.py
   appTitle: 'Paperless-ngx',
   tag: 'prod',
-  version: '2.20.12',
+  version: '2.20.14',
   webSocketHost: window.location.host,
   webSocketProtocol: window.location.protocol == 'https:' ? 'wss:' : 'ws:',
   webSocketBaseUrl: base_url.pathname + 'ws/',

src/documents/index.py

@@ -470,7 +470,14 @@ class DelayedFullTextQuery(DelayedQuery):
         try:
             corrected = self.searcher.correct_query(q, q_str)
             if corrected.string != q_str:
-                suggested_correction = corrected.string
+                corrected_results = self.searcher.search(
+                    corrected.query,
+                    limit=1,
+                    filter=MappedDocIdSet(self.filter_queryset, self.searcher.ixreader),
+                    scored=False,
+                )
+                if len(corrected_results) > 0:
+                    suggested_correction = corrected.string
         except Exception as e:
             logger.info(
                 "Error while correcting query %s: %s",

src/documents/serialisers.py

@@ -853,6 +853,25 @@ class ReadWriteSerializerMethodField(serializers.SerializerMethodField):
         return {self.field_name: data}
 
 
+def validate_documentlink_targets(user, doc_ids):
+    if Document.objects.filter(id__in=doc_ids).count() != len(doc_ids):
+        raise serializers.ValidationError(
+            "Some documents in value don't exist or were specified twice.",
+        )
+
+    if user is None:
+        return
+
+    target_documents = Document.objects.filter(id__in=doc_ids).select_related("owner")
+    if not all(
+        has_perms_owner_aware(user, "change_document", document)
+        for document in target_documents
+    ):
+        raise PermissionDenied(
+            _("Insufficient permissions."),
+        )
+
+
 class CustomFieldInstanceSerializer(serializers.ModelSerializer):
     field = serializers.PrimaryKeyRelatedField(queryset=CustomField.objects.all())
     value = ReadWriteSerializerMethodField(allow_null=True)
@@ -943,12 +962,13 @@ class CustomFieldInstanceSerializer(serializers.ModelSerializer):
                         "Value must be a list",
                     )
                 doc_ids = data["value"]
-                if Document.objects.filter(id__in=doc_ids).count() != len(
+                request = self.context.get("request")
-                    data["value"],
+                validate_documentlink_targets(
-                ):
+                    getattr(request, "user", None) if request is not None else None,
-                    raise serializers.ValidationError(
+                    doc_ids,
-                        "Some documents in value don't exist or were specified twice.",
+                )
-                    )
+            elif field.data_type == CustomField.FieldDataType.DATE:
+                data["value"] = serializers.DateField().to_internal_value(data["value"])
 
         return data
 
@@ -1498,6 +1518,19 @@ class BulkEditSerializer(
                 f"Some custom fields in {name} don't exist or were specified twice.",
             )
 
+        if isinstance(custom_fields, dict):
+            custom_field_map = CustomField.objects.in_bulk(ids)
+            for raw_field_id, value in custom_fields.items():
+                field = custom_field_map.get(int(raw_field_id))
+                if (
+                    field is not None
+                    and field.data_type == CustomField.FieldDataType.DOCUMENTLINK
+                    and value is not None
+                ):
+                    if not isinstance(value, list):
+                        raise serializers.ValidationError("Value must be a list")
+                    validate_documentlink_targets(self.user, value)
+
     def validate_method(self, method):
         if method == "set_correspondent":
             return bulk_edit.set_correspondent

src/documents/signals/handlers.py

@@ -818,7 +818,6 @@ def run_workflows(
             # Refresh this so the matching data is fresh and instance fields are re-freshed
             # Otherwise, this instance might be behind and overwrite the work another process did
             document.refresh_from_db()
-            doc_tag_ids = list(document.tags.values_list("pk", flat=True))
 
         if matching.document_matches_workflow(document, workflow, trigger_type):
             action: WorkflowAction
@@ -836,14 +835,13 @@ def run_workflows(
                         apply_assignment_to_document(
                             action,
                             document,
-                            doc_tag_ids,
                             logging_group,
                         )
                 elif action.type == WorkflowAction.WorkflowActionType.REMOVAL:
                     if use_overrides and overrides:
                         apply_removal_to_overrides(action, overrides)
                     else:
-                        apply_removal_to_document(action, document, doc_tag_ids)
+                        apply_removal_to_document(action, document)
                 elif action.type == WorkflowAction.WorkflowActionType.EMAIL:
                     context = build_workflow_action_context(document, overrides)
                     execute_email_action(
@@ -886,7 +884,6 @@ def run_workflows(
                         "modified",
                     ],
                 )
-                document.tags.set(doc_tag_ids)
 
             WorkflowRun.objects.create(
                 workflow=workflow,

src/documents/tests/test_api_bulk_edit.py

@@ -262,6 +262,50 @@ class TestBulkEditAPI(DirectoriesMixin, APITestCase):
         self.assertEqual(kwargs["add_custom_fields"], [self.cf1.id])
         self.assertEqual(kwargs["remove_custom_fields"], [self.cf2.id])
 
+    @mock.patch("documents.serialisers.bulk_edit.modify_custom_fields")
+    def test_api_modify_custom_fields_documentlink_forbidden_for_unpermitted_target(
+        self,
+        m,
+    ):
+        self.setup_mock(m, "modify_custom_fields")
+        user = User.objects.create_user(username="doc-owner")
+        user.user_permissions.add(Permission.objects.get(codename="change_document"))
+        other_user = User.objects.create_user(username="other-user")
+        source_doc = Document.objects.create(
+            checksum="source",
+            title="Source",
+            owner=user,
+        )
+        target_doc = Document.objects.create(
+            checksum="target",
+            title="Target",
+            owner=other_user,
+        )
+        doclink_field = CustomField.objects.create(
+            name="doclink",
+            data_type=CustomField.FieldDataType.DOCUMENTLINK,
+        )
+
+        self.client.force_authenticate(user=user)
+
+        response = self.client.post(
+            "/api/documents/bulk_edit/",
+            json.dumps(
+                {
+                    "documents": [source_doc.id],
+                    "method": "modify_custom_fields",
+                    "parameters": {
+                        "add_custom_fields": {doclink_field.id: [target_doc.id]},
+                        "remove_custom_fields": [],
+                    },
+                },
+            ),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        m.assert_not_called()
+
     @mock.patch("documents.serialisers.bulk_edit.modify_custom_fields")
     def test_api_modify_custom_fields_with_values(self, m):
         self.setup_mock(m, "modify_custom_fields")

src/documents/tests/test_api_custom_fields.py

@@ -6,6 +6,7 @@ from unittest.mock import ANY
 from django.contrib.auth.models import Permission
 from django.contrib.auth.models import User
 from django.test import override_settings
+from guardian.shortcuts import assign_perm
 from rest_framework import status
 from rest_framework.test import APITestCase
 
@@ -1247,6 +1248,100 @@ class TestCustomFieldsAPI(DirectoriesMixin, APITestCase):
         self.assertEqual(resp.status_code, status.HTTP_200_OK)
         self.assertEqual(doc5.custom_fields.first().value, [1])
 
+    def test_documentlink_patch_requires_change_permission_on_target_documents(self):
+        source_owner = User.objects.create_user(username="source-owner")
+        source_owner.user_permissions.add(
+            Permission.objects.get(codename="change_document"),
+        )
+        other_user = User.objects.create_user(username="other-user")
+
+        source_doc = Document.objects.create(
+            title="Source",
+            checksum="source",
+            mime_type="application/pdf",
+            owner=source_owner,
+        )
+        target_doc = Document.objects.create(
+            title="Target",
+            checksum="target",
+            mime_type="application/pdf",
+            owner=other_user,
+        )
+        custom_field_doclink = CustomField.objects.create(
+            name="Test Custom Field Doc Link",
+            data_type=CustomField.FieldDataType.DOCUMENTLINK,
+        )
+
+        self.client.force_authenticate(user=source_owner)
+
+        resp = self.client.patch(
+            f"/api/documents/{source_doc.id}/",
+            data={
+                "custom_fields": [
+                    {
+                        "field": custom_field_doclink.id,
+                        "value": [target_doc.id],
+                    },
+                ],
+            },
+            format="json",
+        )
+
+        self.assertEqual(resp.status_code, status.HTTP_403_FORBIDDEN)
+        self.assertEqual(
+            CustomFieldInstance.objects.filter(field=custom_field_doclink).count(),
+            0,
+        )
+
+    def test_documentlink_patch_allowed_with_change_permission_on_target_documents(
+        self,
+    ):
+        source_owner = User.objects.create_user(username="source-owner")
+        source_owner.user_permissions.add(
+            Permission.objects.get(codename="change_document"),
+        )
+        other_user = User.objects.create_user(username="other-user")
+
+        source_doc = Document.objects.create(
+            title="Source",
+            checksum="source",
+            mime_type="application/pdf",
+            owner=source_owner,
+        )
+        target_doc = Document.objects.create(
+            title="Target",
+            checksum="target",
+            mime_type="application/pdf",
+            owner=other_user,
+        )
+        custom_field_doclink = CustomField.objects.create(
+            name="Test Custom Field Doc Link",
+            data_type=CustomField.FieldDataType.DOCUMENTLINK,
+        )
+
+        assign_perm("change_document", source_owner, target_doc)
+        self.client.force_authenticate(user=source_owner)
+
+        resp = self.client.patch(
+            f"/api/documents/{source_doc.id}/",
+            data={
+                "custom_fields": [
+                    {
+                        "field": custom_field_doclink.id,
+                        "value": [target_doc.id],
+                    },
+                ],
+            },
+            format="json",
+        )
+
+        self.assertEqual(resp.status_code, status.HTTP_200_OK)
+        target_doc.refresh_from_db()
+        self.assertEqual(
+            target_doc.custom_fields.get(field=custom_field_doclink).value,
+            [source_doc.id],
+        )
+
     def test_custom_field_filters(self):
         custom_field_string = CustomField.objects.create(
             name="Test Custom Field String",
@@ -1330,3 +1425,41 @@ class TestCustomFieldsAPI(DirectoriesMixin, APITestCase):
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         results = response.data["results"]
         self.assertEqual(results[0]["document_count"], 0)
+
+    def test_patch_document_invalid_date_custom_field_returns_validation_error(self):
+        """
+        GIVEN:
+            - A date custom field
+            - A document
+        WHEN:
+            - Patching the document with a date string in the wrong format
+        THEN:
+            - HTTP 400 is returned instead of an internal server error
+            - No custom field instance is created
+        """
+        cf_date = CustomField.objects.create(
+            name="datefield",
+            data_type=CustomField.FieldDataType.DATE,
+        )
+        doc = Document.objects.create(
+            title="Doc",
+            checksum="123",
+            mime_type="application/pdf",
+        )
+
+        response = self.client.patch(
+            f"/api/documents/{doc.pk}/",
+            {
+                "custom_fields": [
+                    {
+                        "field": cf_date.pk,
+                        "value": "10.03.2026",
+                    },
+                ],
+            },
+            format="json",
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertIn("custom_fields", response.data)
+        self.assertEqual(CustomFieldInstance.objects.count(), 0)

src/documents/tests/test_api_documents.py

@@ -1087,6 +1087,43 @@ class TestDocumentApi(DirectoriesMixin, DocumentConsumeDelayMixin, APITestCase):
         self.assertEqual(len(response.data["all"]), 50)
         self.assertCountEqual(response.data["all"], [d.id for d in docs])
 
+    def test_default_ordering_uses_id_as_tiebreaker(self):
+        """
+        GIVEN:
+            - Documents sharing the same created date
+        WHEN:
+            - API request for documents without an explicit ordering
+        THEN:
+            - Results are correctly ordered by created > id
+        """
+        older_doc = Document.objects.create(
+            checksum="older",
+            content="older",
+            created=date(2024, 1, 1),
+        )
+        first_same_date_doc = Document.objects.create(
+            checksum="same-date-1",
+            content="same-date-1",
+            created=date(2024, 1, 2),
+        )
+        second_same_date_doc = Document.objects.create(
+            checksum="same-date-2",
+            content="same-date-2",
+            created=date(2024, 1, 2),
+        )
+
+        response = self.client.get("/api/documents/")
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(
+            [result["id"] for result in response.data["results"]],
+            [
+                second_same_date_doc.id,
+                first_same_date_doc.id,
+                older_doc.id,
+            ],
+        )
+
     def test_statistics(self):
         doc1 = Document.objects.create(
             title="none1",
@@ -2953,6 +2990,58 @@ class TestDocumentApi(DirectoriesMixin, DocumentConsumeDelayMixin, APITestCase):
         self.assertEqual(create_resp.status_code, status.HTTP_201_CREATED)
         self.assertEqual(create_resp.data["document"], doc.pk)
 
+    def test_share_link_update_methods_not_allowed(self):
+        """
+        GIVEN:
+            - An existing share link
+        WHEN:
+            - PUT and PATCH requests are made to its detail endpoint
+        THEN:
+            - The API rejects them with 405 and the link is unchanged
+        """
+        doc = Document.objects.create(
+            title="test",
+            mime_type="application/pdf",
+            content="share link content",
+        )
+        expiration = timezone.now() + timedelta(days=7)
+        create_resp = self.client.post(
+            "/api/share_links/",
+            data={
+                "document": doc.pk,
+                "expiration": expiration.isoformat(),
+                "file_version": ShareLink.FileVersion.ORIGINAL,
+            },
+            format="json",
+        )
+        self.assertEqual(create_resp.status_code, status.HTTP_201_CREATED)
+        share_link_id = create_resp.data["id"]
+
+        patch_resp = self.client.patch(
+            f"/api/share_links/{share_link_id}/",
+            data={
+                "expiration": None,
+                "file_version": ShareLink.FileVersion.ARCHIVE,
+            },
+            format="json",
+        )
+        self.assertEqual(patch_resp.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)
+
+        put_resp = self.client.put(
+            f"/api/share_links/{share_link_id}/",
+            data={
+                "document": doc.pk,
+                "expiration": None,
+                "file_version": ShareLink.FileVersion.ARCHIVE,
+            },
+            format="json",
+        )
+        self.assertEqual(put_resp.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)
+
+        share_link = ShareLink.objects.get(pk=share_link_id)
+        self.assertEqual(share_link.file_version, ShareLink.FileVersion.ORIGINAL)
+        self.assertIsNotNone(share_link.expiration)
+
     def test_next_asn(self):
         """
         GIVEN:

src/documents/tests/test_api_search.py

@@ -702,6 +702,40 @@ class TestDocumentSearchApi(DirectoriesMixin, APITestCase):
 
         self.assertEqual(correction, None)
 
+    def test_search_spelling_suggestion_suppressed_for_private_terms(self):
+        owner = User.objects.create_user("owner")
+        attacker = User.objects.create_user("attacker")
+        attacker.user_permissions.add(
+            Permission.objects.get(codename="view_document"),
+        )
+
+        with AsyncWriter(index.open_index()) as writer:
+            for i in range(55):
+                private_doc = Document.objects.create(
+                    checksum=f"p{i}",
+                    pk=100 + i,
+                    title=f"Private Document {i + 1}",
+                    content=f"treasury document {i + 1}",
+                    owner=owner,
+                )
+                visible_doc = Document.objects.create(
+                    checksum=f"v{i}",
+                    pk=200 + i,
+                    title=f"Visible Document {i + 1}",
+                    content=f"public ledger {i + 1}",
+                    owner=attacker,
+                )
+                index.update_document(writer, private_doc)
+                index.update_document(writer, visible_doc)
+
+        self.client.force_authenticate(user=attacker)
+
+        response = self.client.get("/api/documents/?query=treasurx")
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data["count"], 0)
+        self.assertIsNone(response.data["corrected_query"])
+
     @mock.patch(
         "whoosh.searching.Searcher.correct_query",
         side_effect=Exception("Test error"),
@@ -772,6 +806,58 @@ class TestDocumentSearchApi(DirectoriesMixin, APITestCase):
         self.assertEqual(results[0]["id"], d3.id)
         self.assertEqual(results[1]["id"], d1.id)
 
+    def test_search_more_like_requires_view_permission_on_seed_document(self):
+        """
+        GIVEN:
+            - A user can search documents they own
+            - Another user's private document exists with similar content
+        WHEN:
+            - The user requests more-like-this for the private seed document
+        THEN:
+            - The request is rejected
+        """
+        owner = User.objects.create_user("owner")
+        attacker = User.objects.create_user("attacker")
+        attacker.user_permissions.add(
+            Permission.objects.get(codename="view_document"),
+        )
+
+        private_seed = Document.objects.create(
+            title="private bank statement",
+            content="quarterly treasury bank statement wire transfer",
+            checksum="seed",
+            owner=owner,
+            pk=10,
+        )
+        visible_doc = Document.objects.create(
+            title="attacker-visible match",
+            content="quarterly treasury bank statement wire transfer summary",
+            checksum="visible",
+            owner=attacker,
+            pk=11,
+        )
+        other_doc = Document.objects.create(
+            title="unrelated",
+            content="completely different topic",
+            checksum="other",
+            owner=attacker,
+            pk=12,
+        )
+
+        with AsyncWriter(index.open_index()) as writer:
+            index.update_document(writer, private_seed)
+            index.update_document(writer, visible_doc)
+            index.update_document(writer, other_doc)
+
+        self.client.force_authenticate(user=attacker)
+
+        response = self.client.get(
+            f"/api/documents/?more_like_id={private_seed.id}",
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.assertEqual(response.content, b"Insufficient permissions.")
+
     def test_search_filtering(self):
         t = Tag.objects.create(name="tag")
         t2 = Tag.objects.create(name="tag2")

src/documents/tests/test_workflows.py

@@ -3512,6 +3512,124 @@ class TestWorkflows(
             as_json=False,
         )
 
+    @mock.patch("documents.signals.handlers.execute_webhook_action")
+    def test_workflow_webhook_action_does_not_overwrite_concurrent_tags(
+        self,
+        mock_execute_webhook_action,
+    ):
+        """
+        GIVEN:
+            - A document updated workflow with only a webhook action
+            - A tag update that happens after run_workflows
+        WHEN:
+            - The workflow runs
+        THEN:
+            - The concurrent tag update is preserved
+        """
+        trigger = WorkflowTrigger.objects.create(
+            type=WorkflowTrigger.WorkflowTriggerType.DOCUMENT_UPDATED,
+        )
+        webhook_action = WorkflowActionWebhook.objects.create(
+            use_params=False,
+            body="Test message: {{doc_url}}",
+            url="http://paperless-ngx.com",
+            include_document=False,
+        )
+        action = WorkflowAction.objects.create(
+            type=WorkflowAction.WorkflowActionType.WEBHOOK,
+            webhook=webhook_action,
+        )
+        w = Workflow.objects.create(
+            name="Webhook workflow",
+            order=0,
+        )
+        w.triggers.add(trigger)
+        w.actions.add(action)
+        w.save()
+
+        inbox_tag = Tag.objects.create(name="inbox")
+        error_tag = Tag.objects.create(name="error")
+        doc = Document.objects.create(
+            title="sample test",
+            correspondent=self.c,
+            original_filename="sample.pdf",
+        )
+        doc.tags.add(inbox_tag)
+
+        def add_error_tag(*args, **kwargs):
+            Document.objects.get(pk=doc.pk).tags.add(error_tag)
+
+        mock_execute_webhook_action.side_effect = add_error_tag
+
+        run_workflows(WorkflowTrigger.WorkflowTriggerType.DOCUMENT_UPDATED, doc)
+
+        doc.refresh_from_db()
+        self.assertCountEqual(doc.tags.all(), [inbox_tag, error_tag])
+
+    @mock.patch("documents.signals.handlers.execute_webhook_action")
+    def test_workflow_tag_actions_do_not_overwrite_concurrent_tags(
+        self,
+        mock_execute_webhook_action,
+    ):
+        """
+        GIVEN:
+            - A document updated workflow that clears tags and assigns an inbox tag
+            - A later tag update that happens before the workflow finishes
+        WHEN:
+            - The workflow runs
+        THEN:
+            - The later tag update is preserved
+        """
+        trigger = WorkflowTrigger.objects.create(
+            type=WorkflowTrigger.WorkflowTriggerType.DOCUMENT_UPDATED,
+        )
+        removal_action = WorkflowAction.objects.create(
+            type=WorkflowAction.WorkflowActionType.REMOVAL,
+            remove_all_tags=True,
+        )
+        assign_action = WorkflowAction.objects.create(
+            assign_owner=self.user2,
+        )
+        assign_action.assign_tags.add(self.t1)
+        webhook_action = WorkflowActionWebhook.objects.create(
+            use_params=False,
+            body="Test message: {{doc_url}}",
+            url="http://paperless-ngx.com",
+            include_document=False,
+        )
+        notify_action = WorkflowAction.objects.create(
+            type=WorkflowAction.WorkflowActionType.WEBHOOK,
+            webhook=webhook_action,
+        )
+        w = Workflow.objects.create(
+            name="Workflow tag race",
+            order=0,
+        )
+        w.triggers.add(trigger)
+        w.actions.add(removal_action)
+        w.actions.add(assign_action)
+        w.actions.add(notify_action)
+        w.save()
+
+        doc = Document.objects.create(
+            title="sample test",
+            correspondent=self.c,
+            original_filename="sample.pdf",
+            owner=self.user3,
+        )
+        doc.tags.add(self.t2, self.t3)
+
+        def add_error_tag(*args, **kwargs):
+            Document.objects.get(pk=doc.pk).tags.add(self.t2)
+
+        mock_execute_webhook_action.side_effect = add_error_tag
+
+        run_workflows(WorkflowTrigger.WorkflowTriggerType.DOCUMENT_UPDATED, doc)
+
+        doc.refresh_from_db()
+        self.assertEqual(doc.owner, self.user2)
+        self.assertCountEqual(doc.tags.all(), [self.t1, self.t2])
+
     @override_settings(
         PAPERLESS_URL="http://localhost:8000",
     )

src/documents/views.py

@@ -49,6 +49,7 @@ from django.utils import timezone
 from django.utils.decorators import method_decorator
 from django.utils.timezone import make_aware
 from django.utils.translation import get_language
+from django.utils.translation import gettext_lazy as _
 from django.views import View
 from django.views.decorators.cache import cache_control
 from django.views.decorators.http import condition
@@ -70,10 +71,12 @@ from rest_framework import parsers
 from rest_framework import serializers
 from rest_framework.decorators import action
 from rest_framework.exceptions import NotFound
+from rest_framework.exceptions import PermissionDenied
 from rest_framework.exceptions import ValidationError
 from rest_framework.filters import OrderingFilter
 from rest_framework.filters import SearchFilter
 from rest_framework.generics import GenericAPIView
+from rest_framework.mixins import CreateModelMixin
 from rest_framework.mixins import DestroyModelMixin
 from rest_framework.mixins import ListModelMixin
 from rest_framework.mixins import RetrieveModelMixin
@@ -783,7 +786,7 @@ class DocumentViewSet(
     def get_queryset(self):
         return (
             Document.objects.distinct()
-            .order_by("-created")
+            .order_by("-created", "-id")
             .annotate(num_notes=Count("notes"))
             .select_related("correspondent", "storage_path", "document_type", "owner")
             .prefetch_related("tags", "custom_fields", "notes")
@@ -1369,11 +1372,28 @@ class UnifiedSearchViewSet(DocumentViewSet):
         filtered_queryset = super().filter_queryset(queryset)
 
         if self._is_search_request():
-            from documents import index
-
             if "query" in self.request.query_params:
+                from documents import index
+
                 query_class = index.DelayedFullTextQuery
             elif "more_like_id" in self.request.query_params:
+                try:
+                    more_like_doc_id = int(self.request.query_params["more_like_id"])
+                    more_like_doc = Document.objects.select_related("owner").get(
+                        pk=more_like_doc_id,
+                    )
+                except (TypeError, ValueError, Document.DoesNotExist):
+                    raise PermissionDenied(_("Invalid more_like_id"))
+
+                if not has_perms_owner_aware(
+                    self.request.user,
+                    "view_document",
+                    more_like_doc,
+                ):
+                    raise PermissionDenied(_("Insufficient permissions."))
+
+                from documents import index
+
                 query_class = index.DelayedMoreLikeThisQuery
             else:
                 raise ValueError
@@ -1409,6 +1429,8 @@ class UnifiedSearchViewSet(DocumentViewSet):
                     return response
             except NotFound:
                 raise
+            except PermissionDenied as e:
+                return HttpResponseForbidden(str(e.detail))
             except Exception as e:
                 logger.warning(f"An error occurred listing search results: {e!s}")
                 return HttpResponseBadRequest(
@@ -2681,7 +2703,14 @@ class TasksViewSet(ReadOnlyModelViewSet):
             )
 
 
-class ShareLinkViewSet(ModelViewSet, PassUserMixin):
+class ShareLinkViewSet(
+    PassUserMixin,
+    CreateModelMixin,
+    RetrieveModelMixin,
+    DestroyModelMixin,
+    ListModelMixin,
+    GenericViewSet,
+):
     model = ShareLink
 
     queryset = ShareLink.objects.all()

src/documents/workflows/mutations.py

@@ -16,7 +16,6 @@ logger = logging.getLogger("paperless.workflows.mutations")
 def apply_assignment_to_document(
     action: WorkflowAction,
     document: Document,
-    doc_tag_ids: list[int],
     logging_group,
 ):
     """
@@ -25,12 +24,7 @@ def apply_assignment_to_document(
     action: WorkflowAction, annotated with 'has_assign_*' boolean fields
     """
     if action.has_assign_tags:
-        tag_ids_to_add: set[int] = set()
+        document.add_nested_tags(action.assign_tags.all())
-        for tag in action.assign_tags.all():
-            tag_ids_to_add.add(tag.pk)
-            tag_ids_to_add.update(int(pk) for pk in tag.get_ancestors_pks())
-
-        doc_tag_ids[:] = list(set(doc_tag_ids) | tag_ids_to_add)
 
     if action.assign_correspondent:
         document.correspondent = action.assign_correspondent
@@ -197,7 +191,6 @@ def apply_assignment_to_overrides(
 def apply_removal_to_document(
     action: WorkflowAction,
     document: Document,
-    doc_tag_ids: list[int],
 ):
     """
     Apply removal actions to a Document instance.
@@ -206,14 +199,15 @@ def apply_removal_to_document(
     """
 
     if action.remove_all_tags:
-        doc_tag_ids.clear()
+        document.tags.clear()
     else:
         tag_ids_to_remove: set[int] = set()
         for tag in action.remove_tags.all():
             tag_ids_to_remove.add(tag.pk)
             tag_ids_to_remove.update(int(pk) for pk in tag.get_descendants_pks())
 
-        doc_tag_ids[:] = [t for t in doc_tag_ids if t not in tag_ids_to_remove]
+        if tag_ids_to_remove:
+            document.tags.remove(*tag_ids_to_remove)
 
     if action.remove_all_correspondents or (
         document.correspondent

src/paperless/version.py

@@ -1,6 +1,6 @@
 from typing import Final
 
-__version__: Final[tuple[int, int, int]] = (2, 20, 12)
+__version__: Final[tuple[int, int, int]] = (2, 20, 14)
 # Version string like X.Y.Z
 __full_version_str__: Final[str] = ".".join(map(str, __version__))
 # Version string like X.Y

src/paperless_mail/mail.py

@@ -472,6 +472,7 @@ class MailAccountHandler(LoggingMixin):
                 name=name,
                 defaults={
                     "match": name,
+                    "matching_algorithm": Correspondent.MATCH_LITERAL,
                 },
             )[0]
         except DatabaseError as e:

src/paperless_mail/serialisers.py

@@ -1,5 +1,9 @@
+from django.utils.translation import gettext as _
 from rest_framework import serializers
+from rest_framework.exceptions import PermissionDenied
 
+from documents.permissions import get_objects_for_user_owner_aware
+from documents.permissions import has_perms_owner_aware
 from documents.serialisers import CorrespondentField
 from documents.serialisers import DocumentTypeField
 from documents.serialisers import OwnedObjectSerializer
@@ -56,7 +60,18 @@ class MailAccountSerializer(OwnedObjectSerializer):
 
 class AccountField(serializers.PrimaryKeyRelatedField):
     def get_queryset(self):
-        return MailAccount.objects.all().order_by("-id")
+        user = getattr(self.context.get("request"), "user", None)
+        if user is None:
+            user = getattr(self.root, "user", None)
+
+        if user is None:
+            return MailAccount.objects.none()
+
+        return get_objects_for_user_owner_aware(
+            user,
+            "change_mailaccount",
+            MailAccount,
+        ).order_by("-id")
 
 
 class MailRuleSerializer(OwnedObjectSerializer):
@@ -127,6 +142,18 @@ class MailRuleSerializer(OwnedObjectSerializer):
 
         return attrs
 
+    def validate_account(self, account):
+        if self.user is not None and has_perms_owner_aware(
+            self.user,
+            "change_mailaccount",
+            account,
+        ):
+            return account
+
+        raise PermissionDenied(
+            _("Insufficient permissions."),
+        )
+
     def validate_maximum_age(self, value):
         if value > 36500:  # ~100 years
             raise serializers.ValidationError("Maximum mail age is unreasonably large.")

src/paperless_mail/tests/test_api.py

@@ -632,6 +632,132 @@ class TestAPIMailRules(DirectoriesMixin, APITestCase):
         self.assertEqual(returned_rule1.name, "Updated Name 1")
         self.assertEqual(returned_rule1.action, MailRule.MailAction.DELETE)
 
+    def test_create_mail_rule_scopes_accounts(self):
+        other_user = User.objects.create_user(username="mail-owner")
+        foreign_account = MailAccount.objects.create(
+            name="ForeignEmail",
+            username="username1",
+            password="password1",
+            imap_server="server.example.com",
+            imap_port=443,
+            imap_security=MailAccount.ImapSecurity.SSL,
+            character_set="UTF-8",
+            owner=other_user,
+        )
+
+        response = self.client.post(
+            self.ENDPOINT,
+            data={
+                "name": "Rule1",
+                "account": foreign_account.pk,
+                "folder": "INBOX",
+                "filter_from": "from@example.com",
+                "maximum_age": 30,
+                "action": MailRule.MailAction.MARK_READ,
+                "assign_title_from": MailRule.TitleSource.FROM_SUBJECT,
+                "assign_correspondent_from": MailRule.CorrespondentSource.FROM_NOTHING,
+                "order": 0,
+                "attachment_type": MailRule.AttachmentProcessing.ATTACHMENTS_ONLY,
+            },
+        )
+        missing_response = self.client.post(
+            self.ENDPOINT,
+            data={
+                "name": "Rule1",
+                "account": foreign_account.pk + 1000,
+                "folder": "INBOX",
+                "filter_from": "from@example.com",
+                "maximum_age": 30,
+                "action": MailRule.MailAction.MARK_READ,
+                "assign_title_from": MailRule.TitleSource.FROM_SUBJECT,
+                "assign_correspondent_from": MailRule.CorrespondentSource.FROM_NOTHING,
+                "order": 0,
+                "attachment_type": MailRule.AttachmentProcessing.ATTACHMENTS_ONLY,
+            },
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(missing_response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(response.data["account"][0].code, "does_not_exist")
+        self.assertEqual(missing_response.data["account"][0].code, "does_not_exist")
+        self.assertEqual(MailRule.objects.count(), 0)
+
+    def test_create_mail_rule_allowed_for_granted_account_change_permission(self):
+        other_user = User.objects.create_user(username="mail-owner")
+        foreign_account = MailAccount.objects.create(
+            name="ForeignEmail",
+            username="username1",
+            password="password1",
+            imap_server="server.example.com",
+            imap_port=443,
+            imap_security=MailAccount.ImapSecurity.SSL,
+            character_set="UTF-8",
+            owner=other_user,
+        )
+        assign_perm("change_mailaccount", self.user, foreign_account)
+
+        response = self.client.post(
+            self.ENDPOINT,
+            data={
+                "name": "Rule1",
+                "account": foreign_account.pk,
+                "folder": "INBOX",
+                "filter_from": "from@example.com",
+                "maximum_age": 30,
+                "action": MailRule.MailAction.MARK_READ,
+                "assign_title_from": MailRule.TitleSource.FROM_SUBJECT,
+                "assign_correspondent_from": MailRule.CorrespondentSource.FROM_NOTHING,
+                "order": 0,
+                "attachment_type": MailRule.AttachmentProcessing.ATTACHMENTS_ONLY,
+            },
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(MailRule.objects.get().account, foreign_account)
+
+    def test_update_mail_rule_forbidden_for_unpermitted_account(self):
+        own_account = MailAccount.objects.create(
+            name="Email1",
+            username="username1",
+            password="password1",
+            imap_server="server.example.com",
+            imap_port=443,
+            imap_security=MailAccount.ImapSecurity.SSL,
+            character_set="UTF-8",
+        )
+        other_user = User.objects.create_user(username="mail-owner")
+        foreign_account = MailAccount.objects.create(
+            name="ForeignEmail",
+            username="username2",
+            password="password2",
+            imap_server="server.example.com",
+            imap_port=443,
+            imap_security=MailAccount.ImapSecurity.SSL,
+            character_set="UTF-8",
+            owner=other_user,
+        )
+        rule1 = MailRule.objects.create(
+            name="Rule1",
+            account=own_account,
+            folder="INBOX",
+            filter_from="from@example.com",
+            maximum_age=30,
+            action=MailRule.MailAction.MARK_READ,
+            assign_title_from=MailRule.TitleSource.FROM_SUBJECT,
+            assign_correspondent_from=MailRule.CorrespondentSource.FROM_NOTHING,
+            order=0,
+            attachment_type=MailRule.AttachmentProcessing.ATTACHMENTS_ONLY,
+        )
+
+        response = self.client.patch(
+            f"{self.ENDPOINT}{rule1.pk}/",
+            data={"account": foreign_account.pk},
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        rule1.refresh_from_db()
+        self.assertEqual(rule1.account, own_account)
+
     def test_get_mail_rules_owner_aware(self):
         """
         GIVEN:

src/paperless_mail/tests/test_mail.py

@@ -448,7 +448,7 @@ class TestMail(
         c = handler._get_correspondent(message, rule)
         self.assertIsNotNone(c)
         self.assertEqual(c.name, "someone@somewhere.com")
-        self.assertEqual(c.matching_algorithm, MatchingModel.MATCH_ANY)
+        self.assertEqual(c.matching_algorithm, MatchingModel.MATCH_LITERAL)
         self.assertEqual(c.match, "someone@somewhere.com")
         c = handler._get_correspondent(message2, rule)
         self.assertIsNotNone(c)

uv.lock

@@ -1991,7 +1991,7 @@ wheels = [
 
 [[package]]
 name = "paperless-ngx"
-version = "2.20.12"
+version = "2.20.14"
 source = { virtual = "." }
 dependencies = [
     { name = "babel", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },