Discourse: Stored XSS chat-transcript username unescaped in Rich Text Editor
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.2%
exploitation probability
0.2%top 85% of all CVEs
observed exploitation
nono source reports it
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, the Rich Text Editor rendered a chat-transcript username as HTML, allowing stored cross-site scripting. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Affected products
discourse · discourseReferences
https://github.com/discourse/discourse/commit/32920affe4ad97b461ca2ae2f664c5fefc374bafhttps://github.com/discourse/discourse/commit/3fb1e8ead0d4f48d2cf55c8110825c7e8a6a45f5https://github.com/discourse/discourse/commit/7eb35d076ab9b6a612e86182336ce9787ce402eahttps://github.com/discourse/discourse/commit/9633b8ecaf5a99f0407f5261b9bd1a05f7dac529https://github.com/discourse/discourse/security/advisories/GHSA-wg48-qxjc-f459