CVE-2026-27162: Discourse

Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days.

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, `posts_nearby` was checking topic access but then returning all posts regardless of type, including whispers that should only be visible to whisperers. Use `Post.secured(guardian)` to properly filter post types based on user permissions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

Affected products

• Discourse Discourse: before 2025.12.2 (fixed in 2025.12.2); from 2026.1.0, before 2026.1.1 (fixed in 2026.1.1); version 2026.2.0 only

Published 2026-02-26. Last modified 2026-06-17.