CVE-2026-41657
Admidio: Cross-Organization Member Data Exposure via Permission Check Mismatch in contacts_data.php
MEDIUM 4.9EPSS 0.4%
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.
- Affected
- Admidio · admidio
- CVSS v3.1 GITHUB
- 4.9 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - EPSS
- 0.42% chance of exploitation in the next 30 days, 34th percentile
- Published
- 2026-05-07