diff --git a/server/src/schema/migrations/1779379200000-DeleteMismatchedAssetFaces.ts b/server/src/schema/migrations/1779379200000-DeleteMismatchedAssetFaces.ts
new file mode 100644
index 0000000000..d0387c4038
--- /dev/null
+++ b/server/src/schema/migrations/1779379200000-DeleteMismatchedAssetFaces.ts
@@ -0,0 +1,16 @@
+import { Kysely, sql } from 'kysely';
+
+export async function up(db: Kysely<any>): Promise<void> {
+  // Delete unauthorized cross-owner asset faces
+  await sql`
+    DELETE FROM asset_face
+    USING person, asset
+    WHERE asset_face."personId" = person.id
+      AND asset_face."assetId" = asset.id
+      AND person."ownerId" != asset."ownerId"
+  `.execute(db);
+}
+
+export async function down(): Promise<void> {
+  // Not implemented: the deleted rows were unauthorized cross-owner entries
+}
diff --git a/server/src/services/person.service.spec.ts b/server/src/services/person.service.spec.ts
index 5fa7cb87bd..e6a11786af 100644
--- a/server/src/services/person.service.spec.ts
+++ b/server/src/services/person.service.spec.ts
@@ -452,6 +452,30 @@ describe(PersonService.name, () => {
       expect(mocks.person.update).not.toHaveBeenCalled();
       expect(mocks.job.queueAll).not.toHaveBeenCalled();
     });
+
+    it('should reject creating a face on an asset the user does not own', async () => {
+      const auth = AuthFactory.create();
+      const asset = AssetFactory.create();
+      const person = PersonFactory.create({ faceAssetId: null });
+
+      mocks.access.asset.checkOwnerAccess.mockResolvedValue(new Set());
+      mocks.access.person.checkOwnerAccess.mockResolvedValue(new Set([person.id]));
+
+      await expect(
+        sut.createFace(auth, {
+          assetId: asset.id,
+          personId: person.id,
+          imageHeight: 500,
+          imageWidth: 400,
+          x: 10,
+          y: 20,
+          width: 100,
+          height: 110,
+        }),
+      ).rejects.toBeInstanceOf(BadRequestException);
+
+      expect(mocks.person.createAssetFace).not.toHaveBeenCalled();
+    });
   });
 
   describe('createNewFeaturePhoto', () => {
diff --git a/server/src/services/person.service.ts b/server/src/services/person.service.ts
index de5767ef87..bb17590795 100644
--- a/server/src/services/person.service.ts
+++ b/server/src/services/person.service.ts
@@ -625,7 +625,7 @@ export class PersonService extends BaseService {
   // TODO return a asset face response
   async createFace(auth: AuthDto, dto: AssetFaceCreateDto): Promise<void> {
     await Promise.all([
-      this.requireAccess({ auth, permission: Permission.AssetRead, ids: [dto.assetId] }),
+      this.requireAccess({ auth, permission: Permission.AssetUpdate, ids: [dto.assetId] }),
       this.requireAccess({ auth, permission: Permission.PersonRead, ids: [dto.personId] }),
     ]);