CVE-2026-30927

Admidio is an open-source user management solution. Prior to 5.0.6, in modules/events/events_function.php, the event participation logic allows any user who can participate in an event to register OTHER users by manipulating the user_uuid GET parameter. The condition uses || (OR), meaning if possibleToParticipate() returns true (event is open for participation), ANY user - not just leaders - can specify a different user_uuid and register/cancel participation for that user. The code then operates on $user->getValue('usr_id') (the target user from user_uuid) rather than the current user. This vulnerability is fixed in 5.0.6.

• CWE-639

• https://github.com/Admidio/admidio/commit/e47f70cc3cbcdb39635fdbaaef02d19f604b8c3ePatch
• https://github.com/Admidio/admidio/issues/1985Issue Tracking
• https://github.com/Admidio/admidio/security/advisories/GHSA-7pfv-hr63-h7cwMitigation, Vendor Advisory

Published

Mar 10, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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