CVE-2024-35234: Discourse

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Discourse is an open-source discussion platform. Prior to version 3.2.3 on the `stable` branch and version 3.3.0.beta3 on the `tests-passed` branch, an attacker can execute arbitrary JavaScript on users’ browsers by posting a specific URL containing maliciously crafted meta tags. This issue only affects sites with Content Security Polic (CSP) disabled. The problem has been patched in version 3.2.3 on the `stable` branch and version 3.3.0.beta3 on the `tests-passed` branch. As a workaround, ensure CSP is enabled on the forum.

Affected products

• Discourse Discourse: before 3.2.3 (fixed in 3.2.3); before 3.3.0 (fixed in 3.3.0); version 3.3.0 only

Published 2024-07-03. Last modified 2026-06-17.