ExtensionNavigationThrottle::WillRedirectRequest() {
  ThrottleCheckResult result = WillStartOrRedirectRequest();
  if (result.action() == BLOCK_REQUEST) {
    return CANCEL;
  }
  return result;
}

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.