CVE-2026-117554

Admidio before 5.0.17 contains an improper access control vulnerability that allows authenticated members to register event guests by submitting the additionalguests field when guests are disallowed. Attackers can set additionalguests to the remaining seat count in modules/events/eventsfunction.p...

EUVD-2026-110832

Admidio before 5.0.17 contains an improper access control vulnerability that allows authenticated members to register event guests by submitting the additionalguests field when guests are disallowed. Attackers can set additionalguests to the remaining seat count in modules/events/eventsfunction.p...

CVE-2026-30927: Authorization Bypass Through User-Controlled Key

Admidio is an open-source user management solution. Prior to 5.0.6, in modules/events/eventsfunction.php, the event participation logic allows any user who can participate in an event to register OTHER users by manipulating the useruuid GET parameter. The condition uses || OR, meaning if...