CVE-2026-27481: Discourse

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authorization bypass vulnerability allows unauthenticated or unauthorized users to view hidden (staff-only) tags and its associated data. All Discourse instances with tagging enabled and staff-only tag groups configured are impacted. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

Affected products

• Discourse Discourse: from 2026.1.0, up to and including 2026.1.2; from 2026.2.0, up to and including 2026.2.1; version 2026.3.0 only

Published 2026-04-03. Last modified 2026-07-24.