Description
Discourse is an open-source messaging platform. In versions 2.8.10 and prior on the `stable` branch and versions 2.9.0.beta11 and prior on the `beta` and `tests-passed` branches, users composing malicious messages and navigating to drafts page could self-XSS. This vulnerability can lead to a full XSS on sites which have modified or disabled Discourse’s default Content Security Policy. This issue is patched in the latest stable, beta and tests-passed versions of Discourse.
References (1)
Core 1
Core References
Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-c5h6-6gg5-84fh
Scores
CVSS v3
7.1
EPSS
0.0040
EPSS Percentile
60.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-79
Status
published
Products (2)
discourse/discourse
2.9.0 beta1 (10 CPE variants)
discourse/discourse
< 2.8.10
Published
Nov 29, 2022
Tracked Since
Feb 18, 2026