CVE-2026-53960: Discourse

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, hidden or otherwise unviewable first-post content was leaked as an excerpt in the publicly-served Q&A (QAPage) JSON-LD structured data, exposing it to any unauthenticated visitor and to search-engine crawlers. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Affected products

• Discourse Discourse: before 2026.1.6 (fixed in 2026.1.6); from 2026.5.0-latest, before 2026.5.2 (fixed in 2026.5.2); from 2026.6.0-latest, before 2026.6.1 (fixed in 2026.6.1)

Published 2026-08-17. Last modified 2026-09-18.