Quick answers
- Is CVE-2020-37238 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2020-37238 being exploited in the wild.
- How severe is CVE-2020-37238?
- Medium severity, with a CVSS score of 6.4, published 16 May 2026.
- Which products and versions are affected?
- CMS Made Simple CMS Made Simple <= 2.2.15.
- Is there a fix for CVE-2020-37238?
- 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-2020-37238 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2020-37238?
- 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 stored cross-site scripting (XSS) vulnerability exists in CMS Made Simple versions up to and including 2.2.15. The flaw is located in the File Manager component, which fails to properly sanitize or validate the contents of uploaded SVG files. An authenticated attacker with 'Content Manager' privileges can upload an SVG file containing an embedded <script> block. When another user (such as a site administrator) views the uploaded file via the web interface, the malicious JavaScript executes in the context of their session. This can lead to session hijacking, cookie theft, and unauthorized actions performed on behalf of the victim. While the vendor has released newer versions (e.g., 2.2.22), users should ensure they are running a version that restricts SVG script execution or sanitizes file uploads.
Affected products
- CMS Made Simple CMS Made Simple <= 2.2.15
Timeline
- 2020-12-04: disclosed: Initial exploit published on Exploit-DB
- 2026-05-16: advisory: NVD/VulnCheck advisory published