CVE-2026-41657 Admidio: Cross-Organization Member Data Exposure via Permission Check Mismatch in contacts_data.php
A user manager can bypass permission checks to view all user records across all organizations, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41657?
CVE-2026-41657 is a medium-severity missing authorization vulnerability in admidio, published on 7 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-41657?
2 open source packages ship an affected version, including admidio/admidio.
| Package | Affected | Fixed in |
|---|---|---|
admidio/admidio Packagist | All versions | 5.0.9 |
admidio/admidio Packagist | All versions | 5.0.9 |
How do I fix CVE-2026-41657?
Upgrade admidio/admidio to 5.0.9 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-41657 being exploited?
There is no known exploitation of CVE-2026-41657 in the wild and no public exploit code.
Sources
Also known as GHSA-g8p8-94f2-28gr.