CVE-2026-5203 CMS Made Simple UserGuide Module XML Import class.UserGuideImporterExporter.php _copyFilesToFolder path traversal
Remote attackers can exploit a path traversal flaw in the UserGuide module's XML import to read or modify arbitrary files on the server.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5203?
CVE-2026-5203 is a medium-severity path traversal vulnerability in CMS Made Simple, published on 31 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability was found in CMS Made Simple up to 2.2.22. This impacts the function _copyFilesToFolder in the library modules/UserGuide/lib/class.UserGuideImporterExporter.php of the component UserGuide Module XML Import. The manipulation results in path traversal. It is possible to launch the attack remotely. The exploit has been made public and could be used. This issue has been reported early to the project. They confirmed, that "this has already been discovered and fixed for the next release."
Weakness: CWE-22
Which versions are affected by CVE-2026-5203?
How do I fix CVE-2026-5203?
No fix has been published for CVE-2026-5203 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-5203 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5203 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-6c3w-cf6g-qmgh.