diff --git a/services/core/java/com/android/server/wm/WindowOrganizerController.java b/services/core/java/com/android/server/wm/WindowOrganizerController.java
index 081ee2c82d8ed..ff3b4a5bb44f3 100644
--- a/services/core/java/com/android/server/wm/WindowOrganizerController.java
+++ b/services/core/java/com/android/server/wm/WindowOrganizerController.java
@@ -734,6 +734,12 @@ class WindowOrganizerController extends IWindowOrganizerController.Stub
                     sendTaskFragmentOperationFailure(organizer, errorCallbackToken, exception);
                     break;
                 }
+                if (parent.getTask() != activity.getTask()) {
+                    final Throwable exception = new SecurityException("The reparented activity is"
+                            + " not in the same Task as the target TaskFragment.");
+                    sendTaskFragmentOperationFailure(organizer, errorCallbackToken, exception);
+                    break;
+                }
                 activity.reparent(parent, POSITION_TOP);
                 effects |= TRANSACT_EFFECTS_LIFECYCLE;
                 break;
@@ -1542,6 +1548,12 @@ class WindowOrganizerController extends IWindowOrganizerController.Stub
             sendTaskFragmentOperationFailure(organizer, errorCallbackToken, exception);
             return;
         }
+        if (newParentTF.getTask() != oldParent.getTask()) {
+            final Throwable exception = new SecurityException(
+                    "The new parent is not in the same Task as the old parent.");
+            sendTaskFragmentOperationFailure(organizer, errorCallbackToken, exception);
+            return;
+        }
         while (oldParent.hasChild()) {
             oldParent.getChildAt(0).reparent(newParentTF, POSITION_TOP);
         }
diff --git a/services/tests/wmtests/src/com/android/server/wm/TaskFragmentOrganizerControllerTest.java b/services/tests/wmtests/src/com/android/server/wm/TaskFragmentOrganizerControllerTest.java
index 75b5e73a604e4..5340a79f4b94e 100644
--- a/services/tests/wmtests/src/com/android/server/wm/TaskFragmentOrganizerControllerTest.java
+++ b/services/tests/wmtests/src/com/android/server/wm/TaskFragmentOrganizerControllerTest.java
@@ -511,11 +511,12 @@ public class TaskFragmentOrganizerControllerTest extends WindowTestsBase {
     @Test
     public void testApplyTransaction_reparentActivityToTaskFragment_triggerLifecycleUpdate()
             throws RemoteException {
-        final ActivityRecord activity = createActivityRecord(mDefaultDisplay);
+        final Task task = createTask(mDisplayContent);
+        final ActivityRecord activity = createActivityRecord(task);
         mOrganizer.applyTransaction(mTransaction);
         mController.registerOrganizer(mIOrganizer);
         mTaskFragment = new TaskFragmentBuilder(mAtm)
-                .setCreateParentTask()
+                .setParentTask(task)
                 .setFragmentToken(mFragmentToken)
                 .build();
         mAtm.mWindowOrganizerController.mLaunchTaskFragments