Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a type coercion issue in a post actions API endpoint allowed non-staff users to issue warnings to other users. Warnings are a staff-only moderation feature. The vulnerability required the attacker to be a logged-in user and to send a specifically crafted request. No data exposure or privilege escalation beyond the ability to create unauthorized user warnings was possible. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
discourse discourse
>= 2026.1.0-latest, < 2026.1.2affected>= 2026.2.0-latest, < 2026.2.1affected= 2026.3.0-latestaffected
References
- https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j ↗
- https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be ↗
- https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89 ↗
- https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886 ↗