CVE-2023-45806: Discourse

Medium severity, CVSS 5.4. EPSS: 1% 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, if a user has been quoted and uses a `|` in their full name, they might be able to trigger a bug that generates a lot of duplicate content in all the posts they've been quoted by updating their full name again. Version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches contain a patch for this issue. No known workaround exists, although one can stop the "bleeding" by ensuring users only use alphanumeric characters in their full name field.

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.