CVE-2025-58054: Discourse

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Discourse is an open-source community discussion platform. Versions 3.5.0 and below are vulnerable to XSS attacks through parsing and rendering of chat channel titles and chat thread titles via the quote message functionality when using the rich text editor. This issue is fixed in version 3.5.1.

Affected products

• Discourse Discourse: before 3.5.0 (fixed in 3.5.0); before 3.6.0 (fixed in 3.6.0); version 3.6.0 only

Published 2025-10-01. Last modified 2026-06-17.