CVE-2026-117554
CVE-2026-117554 · Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.3 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Affected products and versions
admidio
- Versions
- ≥ 0, < 5.0.17: Affected (semver)
Update to 5.0.17
Original sources
- https://github.com/Admidio/admidio/issues/2231
- https://github.com/Admidio/admidio
- https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg
- https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9
- https://github.com/Admidio/admidio/releases/tag/v5.0.17
- https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462
- https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php
- https://nvd.nist.gov/vuln/detail/CVE-2026-117554