Auth bypass in Discourse
CVE-2026-27491
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 sta…
Vulnerability class: Broken Access Control
EPSS: 0.000 (15.2th percentile) — read the EPSS interpretation.
Affected products
- Discourse — versions >= 2026.1.0-latest, < 2026.1.2, >= 2026.2.0-latest, < 2026.2.1, = 2026.3.0-latest
Weakness classification (CWE)
References
- https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j (x_refsource_CONFIRM)
- https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be (x_refsource_MISC)
- https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89 (x_refsource_MISC)
- https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886 (x_refsource_MISC)