CVE-2026-117554
MEDIUM
NVD
CVSS Score
4.3
Severity
MEDIUM
Published
Oct 27, 2026
Vendor
unknown
Description
Admidio before 5.0.17 contains an improper access control vulnerability that allows authenticated members to register event guests by submitting the additional_guests field when guests are disallowed. Attackers can set additional_guests to the remaining seat count in modules/events/events_function.php to exhaust event capacity and block other members from registering.
References
- https://github.com/Admidio/admidio
- https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462
- https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9
- https://github.com/Admidio/admidio/issues/2231
- https://github.com/Admidio/admidio/releases/tag/v5.0.17