{"id":"CVE-2026-30927","summary":"Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter","details":"Admidio is an open-source user management solution. Prior to 5.0.6, in modules/events/events_function.php, the event participation logic allows any user who can participate in an event to register OTHER users by manipulating the user_uuid GET parameter. The condition uses || (OR), meaning if possibleToParticipate() returns true (event is open for participation), ANY user - not just leaders - can specify a different user_uuid and register/cancel participation for that user. The code then operates on $user-\u003egetValue('usr_id') (the target user from user_uuid) rather than the current user. This vulnerability is fixed in 5.0.6.","aliases":["GHSA-7pfv-hr63-h7cw"],"modified":"2026-08-12T03:51:29.057766836Z","published":"2026-03-09T23:03:55.824Z","database_specific":{"cwe_ids":["CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30927.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/Admidio/admidio/security/advisories/GHSA-7pfv-hr63-h7cw"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30927.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30927"},{"type":"REPORT","url":"https://github.com/Admidio/admidio/issues/1985"},{"type":"FIX","url":"https://github.com/Admidio/admidio/commit/e47f70cc3cbcdb39635fdbaaef02d19f604b8c3e"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/admidio/admidio","events":[{"introduced":"0"},{"fixed":"e11799f647188263196de4acacf80c9a5ad32b91"},{"fixed":"e47f70cc3cbcdb39635fdbaaef02d19f604b8c3e"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"5.0.6"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:admidio:admidio:*:*:*:*:*:*:*:*"}}],"versions":["v5.0.5","v5.0.4","v34","v5.0.3","v5.0.2","v5.0.1","v5.0.0","v5.0-Beta.3","v5.0-Beta.2","v5.0-Beta.1","v4.3-Beta.1","v4.1-Beta.2","v4.0-Beta.1","v3.2-Beta.1","v3.1.5","v3.0.6","3.0-Beta.3","3.0-Beta.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30927.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"}]}