# 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.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Mar 2026
- **Updated:** 31 Mar 2026
- **Also known as:** GHSA-6c3w-cf6g-qmgh

## 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 (Improper Limitation of a Pathname to a Restricted Directory)

## 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.

## 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:

- https://github.com/CaginKyr/CVE-2026-5203 (github_poc): https://github.com/CaginKyr/CVE-2026-5203

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5203 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5203 exists.

Affected product: CMS Made Simple. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-5203/ (Markdown: https://insights.sbomify.com/CVE-2026-5203/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5203
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5203
- OSV: https://osv.dev/vulnerability/CVE-2026-5203

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5203/
Summaries are generated and may contain mistakes; the official description above is the record.