{"id":"CVE-2026-41657","aliases":["GHSA-g8p8-94f2-28gr"],"url":"https://o3.security/vulnerability/CVE-2026-41657","summary":"Admidio: Cross-Organization Member Data Exposure via Permission Check Mismatch in contacts_data.php","details":"Admidio is an open-source user management solution. Prior to version 5.0.9, the contacts_data.php endpoint uses a weaker permission check (isAdministratorUsers(), requiring only rol_edit_user=true) than the frontend UI (contacts.php) which correctly requires the stronger isAdministrator() (requiring rol_administrator=true) and the contacts_show_all system setting. A user manager who is not a full administrator can directly request contacts_data.php?mem_show_filter=3 to retrieve all user records across all organizations in the Admidio instance, bypassing multi-tenant organization isolation. This issue has been patched in version 5.0.9.","published":"2026-05-07T02:58:09.340Z","modified":"2026-08-07T11:48:55.565238359Z","cvss":{"score":4.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.00322,"percentile":0.24682,"asOf":"2026-08-09"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"admidio/admidio","fixedVersion":"5.0.9"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/Admidio/admidio/releases/tag/v5.0.9"},{"type":"ADVISORY","url":"https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41657.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41657"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:48:55.565238359Z"}}