CVE-2026-33415: Discourse

Low severity, CVSS 2.7. EPSS: 0.3% 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 authenticated moderator-level user could retrieve post content, topic titles, and usernames from categories they were not authorized to view. Insufficient access controls on a sentiment analytics endpoint allowed category permission boundaries to be bypassed. 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, before 2026.1.3 (fixed in 2026.1.3); from 2026.2.0, before 2026.2.2 (fixed in 2026.2.2); version 2026.3.0 only

Published 2026-03-31. Last modified 2026-07-24.