Discourse: Stored XSS in staff action logs injects staff UI
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.4epss 0.2%
exploitation probability
0.2%top 88% of all CVEs
observed exploitation
nono source reports it
Discourse is an open-source discussion platform. Prior to 2026.1.6, the staff action log model rendered unescaped previous and new value fields that could inject stored cross-site scripting into the staff interface. The issue is fixed in 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:L/I:L/A:N
Affected products
discourse · discourseReferences
https://github.com/discourse/discourse/commit/66601a6e6eeeabfcb06d2f692d68534be12de082https://github.com/discourse/discourse/commit/74ae22d85f4e13c7c7f2e3c13fce023feec7e033https://github.com/discourse/discourse/commit/fd44510b4303e7f8f0b42bd070a2d42d3cda259fhttps://github.com/discourse/discourse/security/advisories/GHSA-8x29-vv56-wj6v