std::string SessionStore::GetClientTag(const SessionSpecifics& specifics) {
  DCHECK(AreValidSpecifics(specifics));

  if (specifics.has_header()) {
    return specifics.session_tag();
  }

  DCHECK(specifics.has_tab());
  return TabNodeIdToClientTag(specifics.session_tag(), specifics.tab_node_id());
}

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.