{"id":"CVE-2026-117554","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-117554","generatedAt":"2026-10-27T23:52:55.842Z","title":"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.","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.","published":"2026-10-27T14:16:36.000Z","lastModified":"2026-10-27T14:16:36.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":5.3,"severity":"MEDIUM","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-602"],"affected":[],"epss":null,"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and no EPSS score yet. Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-27T14:16:36.000Z","detail":{"score":"5.3","severity":"MEDIUM","publishedAt":"2026-10-27T14:16:35.990Z"},"summary":"New CVE, medium severity (CVSS 5.3)."}],"references":[{"url":"https://github.com/Admidio/admidio","source":"disclosure@vulncheck.com"},{"url":"https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462","source":"disclosure@vulncheck.com"},{"url":"https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9","source":"disclosure@vulncheck.com"},{"url":"https://github.com/Admidio/admidio/issues/2231","source":"disclosure@vulncheck.com"},{"url":"https://github.com/Admidio/admidio/releases/tag/v5.0.17","source":"disclosure@vulncheck.com"},{"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-117554","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}