{"affected":[{"defaultStatus":"unaffected","ecosystem":"composer","packageName":"admidio/admidio","product":"admidio","source":"CNA: VulnCheck","vendor":"admidio","versions":[{"lessThan":"5.0.17","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-117554","cwes":["CWE-602"],"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.","epss":{"date":"2026-11-02","percentile":0.21508,"score":0.00289},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg"}],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","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","version":"4.0"},{"score":4.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},{"score":5.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":4.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}],"modifiedAt":1793636250397,"publishedAt":1793106470357,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/Admidio/admidio/issues/2231"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/Admidio/admidio"},{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/Admidio/admidio/releases/tag/v5.0.17"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/Admidio/admidio"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/Admidio/admidio/issues/2231"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/Admidio/admidio/releases/tag/v5.0.17"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php"},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":[],"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9"}],"revision":"47babd69c92ef9c13c35777bcbd1ec543cbdedfc00d75f839f61b19ffc2a8628","sources":[{"modifiedAt":1793634862023,"name":"CNA: VulnCheck","retrievedAt":1793639349234,"url":"https://www.cve.org/CVERecord?id=CVE-2026-117554"},{"modifiedAt":1793636250397,"name":"NVD","retrievedAt":1793643454626,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117554"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793635738101,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-117554"}],"ssvc":{"assessedAt":1793634831050,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php","updatedAt":1793643454626}