{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-117554","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-27T11:25:20.165Z","datePublished":"2026-10-27T13:07:50.357Z","dateUpdated":"2026-10-27T13:07:50.357Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-27T13:07:50.357Z"},"datePublic":"2026-10-08T00:00:00.000Z","title":"Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Client-Side Enforcement of Server-Side Security","cweId":"CWE-602","type":"CWE"}]}],"affected":[{"vendor":"admidio","product":"admidio","defaultStatus":"unaffected","packageURL":"pkg:composer/admidio/admidio","versions":[{"status":"affected","version":"0","lessThan":"5.0.17","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:admidio:admidio:*:*:*:*:*:*:*:*","versionEndExcluding":"5.0.17"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM"}}],"references":[{"url":"https://github.com/Admidio/admidio/issues/2231","tags":["issue-tracking"],"name":"GitHub Issue #2231"},{"url":"https://github.com/Admidio/admidio","tags":["product"]},{"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-92g9-59rr-c3qg)"},{"url":"https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9","tags":["patch"]},{"url":"https://github.com/Admidio/admidio/releases/tag/v5.0.17","tags":["release-notes"],"name":"admidio v5.0.17 Release Notes"},{"url":"https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462","tags":["technical-description"]},{"name":"VulnCheck Advisory: Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php"}],"credits":[{"lang":"en","value":"gwangwon0807","type":"finder"},{"lang":"en","value":"choewonwoo1817","type":"finder"},{"lang":"en","value":"J0hnathanKim","type":"finder"},{"lang":"en","value":"Kamba-netizen","type":"finder"},{"lang":"en","value":"t-211","type":"finder"},{"lang":"en","value":"xo0102","type":"finder"},{"lang":"en","value":"Fasse","type":"remediation developer"}],"x_generator":{"engine":"vulncheck-endgame"}}}}