Is CVE-2026-5203 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5203 being exploited in the wild.

How severe is CVE-2026-5203?

Medium severity, with a CVSS score of 4.7, published 31 March 2026.

Which products and versions are affected?

CMS Made Simple CMS Made Simple up to 2.2.22.

Is there a fix for CVE-2026-5203?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-5203 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-5203?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-5203: CMS Made Simple path traversal in UserGuide Module XML Import

CVE-2026-5203 · Severity: medium · CVSS 4.7 · Published 2026-03-31

CMS Made Simple, a popular content management system, contains a security flaw in its UserGuide module. An attacker with administrative privileges can exploit this to access or manipulate files outside of the intended directory. This could lead to the exposure of sensitive system information or unauthorized changes to website files.

Quick answers

Is CVE-2026-5203 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5203 being exploited in the wild.
How severe is CVE-2026-5203?: Medium severity, with a CVSS score of 4.7, published 31 March 2026.
Which products and versions are affected?: CMS Made Simple CMS Made Simple up to 2.2.22.
Is there a fix for CVE-2026-5203?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-5203 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-5203?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A path traversal vulnerability (CWE-22) exists in CMS Made Simple up to version 2.2.22. The flaw is located within the _copyFilesToFolder function in the modules/UserGuide/lib/class.UserGuideImporterExporter.php library of the UserGuide Module XML Import component. A remote attacker with high privileges (PR:H) can manipulate file paths during the XML import process to read or write files outside of the intended directory. While a proof-of-concept exploit is publicly available, the vendor has stated that a fix is planned for the next release.

Affected products

CMS Made Simple CMS Made Simple up to 2.2.22

Timeline

2026-03-31: disclosed: Vulnerability reported and public exploit released.
2026-03-31: advisory: NVD published CVE-2026-5203.

References

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