void WaitForAccessibilityFocusChange() {
  scoped_refptr<content::MessageLoopRunner> loop_runner(
      new content::MessageLoopRunner);
  BrowserAccessibilityManager::SetFocusChangeCallbackForTesting(
      loop_runner->QuitClosure());
  loop_runner->Run();
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.