CVE-2026-41657: Admidio

Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days.

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 products

• Admidio Admidio: before 5.0.9 (fixed in 5.0.9)

Published 2026-05-07. Last modified 2026-06-17.