diff --git a/services/accessibility/java/com/android/server/accessibility/AccessibilitySecurityPolicy.java b/services/accessibility/java/com/android/server/accessibility/AccessibilitySecurityPolicy.java
index c637045589e7b..bc3ffab5ccb6f 100644
--- a/services/accessibility/java/com/android/server/accessibility/AccessibilitySecurityPolicy.java
+++ b/services/accessibility/java/com/android/server/accessibility/AccessibilitySecurityPolicy.java
@@ -647,6 +647,14 @@ public class AccessibilitySecurityPolicy {
             return false;
         }
 
+        if ((serviceInfo.flags & ServiceInfo.FLAG_EXTERNAL_SERVICE) != 0) {
+            Slog.w(LOG_TAG, "Skipping accessibility service " + new ComponentName(
+                    serviceInfo.packageName, serviceInfo.name).flattenToShortString()
+                    + ": the service is the external one and doesn't allow to register as "
+                    + "an accessibility service ");
+            return false;
+        }
+
         int servicePackageUid = serviceInfo.applicationInfo.uid;
         if (mAppOpsManager.noteOpNoThrow(AppOpsManager.OPSTR_BIND_ACCESSIBILITY_SERVICE,
                 servicePackageUid, serviceInfo.packageName, null, null)
diff --git a/services/tests/servicestests/src/com/android/server/accessibility/AccessibilitySecurityPolicyTest.java b/services/tests/servicestests/src/com/android/server/accessibility/AccessibilitySecurityPolicyTest.java
index edacc165016f1..9b56303244c0c 100644
--- a/services/tests/servicestests/src/com/android/server/accessibility/AccessibilitySecurityPolicyTest.java
+++ b/services/tests/servicestests/src/com/android/server/accessibility/AccessibilitySecurityPolicyTest.java
@@ -572,6 +572,18 @@ public class AccessibilitySecurityPolicyTest {
                 serviceInfo.applicationInfo.uid, serviceInfo.packageName, null, null);
     }
 
+    @Test
+    public void canRegisterService_isExternalService_returnFalse() {
+        final ServiceInfo serviceInfo = new ServiceInfo();
+        serviceInfo.applicationInfo = new ApplicationInfo();
+        serviceInfo.packageName = PACKAGE_NAME;
+        serviceInfo.name = AccessibilitySecurityPolicyTest.class.getSimpleName();
+        serviceInfo.permission = android.Manifest.permission.BIND_ACCESSIBILITY_SERVICE;
+        serviceInfo.flags |= ServiceInfo.FLAG_EXTERNAL_SERVICE;
+
+        assertFalse(mA11ySecurityPolicy.canRegisterService(serviceInfo));
+    }
+
     @Test
     public void checkAccessibilityAccess_shouldCheckAppOps() {
         final AccessibilityServiceInfo mockServiceInfo = Mockito.mock(