Vulnerability Description
HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to 1.10.3, a malicious SVG file uploaded to HedgeDoc results in the possibility of XSS when opened in a new tab instead of the editor itself. The XSS is possible by exploiting the JSONP capabilities of GitHub Gist embeddings. Only instances with the local filesystem upload backend or special configurations, where the uploads are served from the same domain as HedgeDoc, are vulnerable. This vulnerability is fixed in 1.10.3. When upgrading to HedgeDoc 1.10.3 is not possible, instance owners could add the following headers for all routes under /uploads as a first-countermeasure: Content-Disposition: attachment and Content-Security-Policy: default-src 'none'. Additionally, the external URLs in the script-src attribute of the Content-Security-Policy header should be removed.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hedgedoc | Hedgedoc | < 1.10.3 |
Related Weaknesses (CWE)
References
- https://github.com/hedgedoc/hedgedoc/commit/0636b5c20b7097afccfa6641830352ad068ePatch
- https://github.com/hedgedoc/hedgedoc/commit/3f520ea59abf912c66d7443cb99f29a567c4Patch
- https://github.com/hedgedoc/hedgedoc/commit/d2585fbd3b398b3359f6f88aa1fda8f4ecf2Patch
- https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-3983-rrqh-mvx5MitigationVendor Advisory
FAQ
What is CVE-2025-32391?
CVE-2025-32391 is a vulnerability with a CVSS score of 6.4 (MEDIUM). HedgeDoc is an open source, real-time, collaborative, markdown notes application. Prior to 1.10.3, a malicious SVG file uploaded to HedgeDoc results in the possibility of XSS when opened in a new tab ...
How severe is CVE-2025-32391?
CVE-2025-32391 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-32391?
Check the references section above for vendor advisories and patch information. Affected products include: Hedgedoc Hedgedoc.