Multiple cross-site request forgery (CSRF) vulnerabilities in Simple PHP Agenda 2.2.8 and earlier allow remote attackers to hijack the authentication of administrators for requests that (1) add an administrator via a request to auth/process.php, (2) delete an administrator via a request to auth/admin/adminprocess.php, (3) add an event via a request to engine/new_event.php, or (4) delete an event via a request to phpagenda/.