CVE-2026-41656 Admidio: Path Traversal via Unvalidated `name` Parameter in Document Add Mode Enables Arbitrary Server File Read
Attackers can read arbitrary server files, including credentials, by exploiting path traversal in the document add mode via a crafted link.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-41656?
CVE-2026-41656 is a medium-severity path traversal vulnerability in admidio, published on 7 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Admidio is an open-source user management solution. Prior to version 5.0.9, the add mode in modules/documents-files.php accepts a name parameter validated only as 'string' type (HTML encoding), allowing path traversal characters (../) to pass through unfiltered. Combined with the absence of CSRF protection on this endpoint and SameSite=Lax session cookies, a low-privileged attacker can trick a documents administrator into clicking a crafted link that registers an arbitrary server file (e.g., install/config.php containing database credentials) into a documents folder accessible to the attacker. This issue has been patched in version 5.0.9.
Weakness: CWE-22
Which versions are affected by CVE-2026-41656?
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-2026-41656?
Upgrade admidio/admidio to 5.0.9 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-41656 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41656 exists.
Sources
Also known as GHSA-m9h6-8pqm-xrhf.