diff --git a/lib/tasks/__tests__/validateDeleteTaskRequest.test.ts b/lib/tasks/__tests__/validateDeleteTaskRequest.test.ts
index 1b6f9207..0b846e48 100644
--- a/lib/tasks/__tests__/validateDeleteTaskRequest.test.ts
+++ b/lib/tasks/__tests__/validateDeleteTaskRequest.test.ts
@@ -62,4 +62,29 @@ describe("validateDeleteTaskRequest", () => {
     const res = await validateDeleteTaskRequest(request);
     expect(res).toBe(forbidden);
   });
+
+  it("forwards body account_id to validateAuthContext as the override (chat#1918)", async () => {
+    const OTHER = "999e4567-e89b-12d3-a456-426614174999";
+    const request = new NextRequest("http://localhost/api/tasks", {
+      method: "DELETE",
+      headers: { "Content-Type": "application/json", "x-api-key": "test-key" },
+      body: JSON.stringify({ id: TASK_ID, account_id: OTHER }),
+    });
+    await validateDeleteTaskRequest(request);
+    expect(validateAuthContext).toHaveBeenCalledWith(
+      expect.anything(),
+      expect.objectContaining({ accountId: OTHER }),
+    );
+  });
+
+  it("rejects a non-UUID account_id with 400", async () => {
+    const request = new NextRequest("http://localhost/api/tasks", {
+      method: "DELETE",
+      headers: { "Content-Type": "application/json", "x-api-key": "test-key" },
+      body: JSON.stringify({ id: TASK_ID, account_id: "not-a-uuid" }),
+    });
+    const result = await validateDeleteTaskRequest(request);
+    expect(result).toBeInstanceOf(NextResponse);
+    expect((result as NextResponse).status).toBe(400);
+  });
 });
diff --git a/lib/tasks/validateDeleteTaskBody.ts b/lib/tasks/validateDeleteTaskBody.ts
index 3136f27d..2ffc5b44 100644
--- a/lib/tasks/validateDeleteTaskBody.ts
+++ b/lib/tasks/validateDeleteTaskBody.ts
@@ -4,6 +4,13 @@ import { z } from "zod";
 
 export const deleteTaskBodySchema = z.object({
   id: z.string().uuid("id must be a valid UUID").describe("UUID of the task to delete"),
+  account_id: z
+    .string()
+    .uuid("account_id must be a valid UUID")
+    .optional()
+    .describe(
+      "Account context for org/API-key rules; authorized via validateAuthContext. Not a raw column override.",
+    ),
 });
 
 export type DeleteTaskBody = z.infer<typeof deleteTaskBodySchema>;
diff --git a/lib/tasks/validateDeleteTaskRequest.ts b/lib/tasks/validateDeleteTaskRequest.ts
index 5247515e..ff872444 100644
--- a/lib/tasks/validateDeleteTaskRequest.ts
+++ b/lib/tasks/validateDeleteTaskRequest.ts
@@ -40,7 +40,12 @@ export async function validateDeleteTaskRequest(
     );
   }
 
-  const authContext = await validateAuthContext(request);
+  // Mirror GET/POST/PATCH: an org or admin key may act in a member account's
+  // context. Without this, an admin key could create and edit a customer's task
+  // but got 403 deleting it (chat#1918).
+  const authContext = await validateAuthContext(request, {
+    accountId: validationResult.data.account_id,
+  });
   if (authContext instanceof NextResponse) {
     return authContext;
   }