CVE-2026-27491 Discourse has a bypass of official warnings messages by non-staff users

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...

CVE-2026-27491

Discourse contains a type coercion vulnerability in the post actions API that allowed non-staff, logged-in users to issue warnings to other users. Affected versions are 2026.3.0-latest.1, 2026.2.1, and 2026.1.2; patch versions are also noted. The underlying cause is a type coercion issue in the p...