CVE-2025-32391

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.

Reserved 2025-04-06 | Published 2025-04-10 | Updated 2025-04-10 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 1.10.3
affected

References

github.com/...dgedoc/security/advisories/GHSA-3983-rrqh-mvx5

github.com/...ommit/0636b5c20b7097afccfa6641830352ad068ef964

github.com/...ommit/3f520ea59abf912c66d7443cb99f29a567c47748

github.com/...ommit/d2585fbd3b398b3359f6f88aa1fda8f4ecf2f78d

cve.org (CVE-2025-32391)

nvd.nist.gov (CVE-2025-32391)

Download JSON