Discourse is an open-source community discussion platform. Versions 3.5.0 and below are vulnerable to XSS attacks through parsing and rendering of chat channel titles and chat thread titles via the quote message functionality when using the rich text editor. This issue is fixed in version 3.5.1.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/discourse/discourse/commit/3a224fd546d894ee408e7414b6879e814a792f91 Patch
- https://github.com/discourse/discourse/security/advisories/GHSA-7p47-8m82-m2vf Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.4 · discourseNVD modified 2026-10-19 17:10
Affected (CPE criteria) 3
cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:*cpe:2.3:a:discourse:discourse:3.6.0:beta1:*:*:beta:*:*:*