CVE-2023-47120: Discourse

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

Discourse is an open source platform for community discussion. In versions 3.1.0 through 3.1.2 of the `stable` branch and versions 3.1.0,beta6 through 3.2.0.beta2 of the `beta` and `tests-passed` branches, Redis memory can be depleted by crafting a site with an abnormally long favicon URL and drafting multiple posts which Onebox it. 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. There are no known workarounds.

Affected products

• Discourse Discourse: from 3.1.0, before 3.1.3 (fixed in 3.1.3); version 3.1.0 only; version 3.2.0 only

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