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...

CVE-2026-117554 Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php

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-2026-117554

Admidio versions before 5.0.17 are vulnerable to an improper access control vulnerability in modules/events/events_function.php. Authenticated members can bypass guest restrictions by submitting the additional_guests field when guests are otherwise disallowed. This allows an attacker to set the v...

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...