NavigationController::NavigationController(
    TabContents* contents,
    Profile* profile,
    SessionStorageNamespace* session_storage_namespace)
    : profile_(profile),
      pending_entry_(NULL),
      last_committed_entry_index_(-1),
      pending_entry_index_(-1),
      transient_entry_index_(-1),
      tab_contents_(contents),
      max_restored_page_id_(-1),
      ALLOW_THIS_IN_INITIALIZER_LIST(ssl_manager_(this)),
      needs_reload_(false),
      session_storage_namespace_(session_storage_namespace),
      pending_reload_(NO_RELOAD) {
  DCHECK(profile_);
  if (!session_storage_namespace_) {
    session_storage_namespace_ = new SessionStorageNamespace(
        profile_->GetWebKitContext());
  }
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.