{"id":"CVE-2026-117554","aliases":[],"title":"Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php","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.","severity":"medium","score":5.3,"published":"2026-10-27T13:07:50.357Z","modified":"2026-10-27T13:07:50.357Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["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"],"sources":[{"name":"CVE","id":"CVE-2026-117554","modified":"2026-10-27T13:07:50.357Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-117554"}],"assessments":[{"source":"CNA","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":5.3},{"source":"CNA","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3}]}