CVE-2023-46130: Discourse

Medium severity, CVSS 5.4. EPSS: 0.7% chance of exploitation in the next 30 days.

Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, some theme components allow users to add svgs with unlimited `height` attributes, and this can affect the availability of subsequent replies in a topic. Most Discourse instances are unaffected, only instances with the svgbob or the mermaid theme component are within scope. The issue is patched in version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches. As a workaround, disable or remove the relevant theme components.

Affected products

• Discourse Discourse: before 3.1.3 (fixed in 3.1.3); before 3.2.0 (fixed in 3.2.0); version 3.2.0 only

Published 2023-11-10. Last modified 2026-06-17.