void RenderWidgetHostImpl::OnMouseEventAck(
    const MouseEventWithLatencyInfo& mouse_event,
    InputEventAckSource ack_source,
    InputEventAckState ack_result) {
  latency_tracker_.OnInputEventAck(mouse_event.event, &mouse_event.latency,
                                   ack_result);
  for (auto& input_event_observer : input_event_observers_)
    input_event_observer.OnInputEventAck(ack_source, ack_result,
                                         mouse_event.event);
}

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.