{"id":"CVE-2026-117554","title":"Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php","summary":"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 …","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-602"],"vendor":"admidio","product":"admidio","affected":["admidio < 5.0.17"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T13:07:50.357Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-117554","references":[{"url":"https://github.com/Admidio/admidio/issues/2231","label":"GitHub Issue #2231"},{"url":"https://github.com/Admidio/admidio"},{"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg","label":"GitHub Security Advisory (GHSA-92g9-59rr-c3qg)"},{"url":"https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9"},{"url":"https://github.com/Admidio/admidio/releases/tag/v5.0.17","label":"admidio v5.0.17 Release Notes"},{"url":"https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462"},{"url":"https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php","label":"VulnCheck Advisory: Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php"}],"tags":["cve.org"],"ingestedAt":"2026-10-27T16:11:59.330Z","slug":"CVE-2026-117554","body":"## Overview\n\nAdmidio 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.\n\n## Affected\n\n- `admidio < 5.0.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}