PT-2026-26359 · Discourse · Discourse

Davidtaylorhq · Published 2026-03-19 · Updated 2026-03-19 · CVE-2026-27491

Mitre

CVSS v4.0

6.9

Medium

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

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.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-27491

Affected Products

Discourse

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-27491 · Security Note
• https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89 · Note
• https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886 · Note
• https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be · Note
• https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j · Note