CVE-2026-41657
Description
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.
How to fix
- admidio/admidio5.0.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| admidio/admidioPackagist | v < 5.0.9 | 5.0.9 |
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