CVE-2026-30927 (GCVE-0-2026-30927)
Vulnerability from cvelistv5 – Published: 2026-03-09 23:03 – Updated: 2026-03-10 13:59
VLAI
EPSS
VEX
Title
Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-10 13:55 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Admidio/admidio/security/advis… | x_refsource_CONFIRM |
| https://github.com/Admidio/admidio/issues/1985 | x_refsource_MISC |
| https://github.com/Admidio/admidio/commit/e47f70c… | x_refsource_MISC |
Impacted products
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