{"id":"CVE-2026-30927","state":"PUBLISHED","title":"Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter","description":"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->getValue('usr_id') (the target user from user_uuid) rather than the current user. This vulnerability is fixed in 5.0.6.","publishedAt":"2026-03-09T23:03:55.824Z","updatedAt":"2026-03-10T13:59:12.645Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["Admidio admidio"],"affected":[{"vendor":"Admidio","product":"admidio","versions":[{"version":"< 5.0.6","status":"affected"}]}],"references":["https://github.com/Admidio/admidio/security/advisories/GHSA-7pfv-hr63-h7cw","https://github.com/Admidio/admidio/issues/1985","https://github.com/Admidio/admidio/commit/e47f70cc3cbcdb39635fdbaaef02d19f604b8c3e"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/30xxx/CVE-2026-30927.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-30927","state":"PUBLISHED","datePublished":"2026-03-09T23:03:55.824Z","dateUpdated":"2026-03-10T13:59:12.645Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-07T16:40:05.884Z"},"containers":{"cna":{"title":"Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter","descriptions":[{"lang":"en","value":"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->getValue('usr_id') (the target user from user_uuid) rather than the current user. This vulnerability is fixed in 5.0.6."}],"affected":[{"vendor":"Admidio","product":"admidio","versions":[{"version":"< 5.0.6","status":"affected"}]}],"references":[{"url":"https://github.com/Admidio/admidio/security/advisories/GHSA-7pfv-hr63-h7cw","name":"https://github.com/Admidio/admidio/security/advisories/GHSA-7pfv-hr63-h7cw","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Admidio/admidio/issues/1985","name":"https://github.com/Admidio/admidio/issues/1985","tags":["x_refsource_MISC"]},{"url":"https://github.com/Admidio/admidio/commit/e47f70cc3cbcdb39635fdbaaef02d19f604b8c3e","name":"https://github.com/Admidio/admidio/commit/e47f70cc3cbcdb39635fdbaaef02d19f604b8c3e","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-09T23:03:55.824Z"},"source":{"advisory":"GHSA-7pfv-hr63-h7cw","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-10T13:55:23.234262Z","id":"CVE-2026-30927","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-10T13:59:12.645Z"}}]}}}