Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, updating a category description via API is not sanitizing the description string, which can lead to XSS attacks. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
https://github.com/discourse/discourse/security/advisories/GHSA-h2h4-767x-6pc8
https://github.com/discourse/discourse/commit/05e3da2a670cfd499649128b6c955b552451240b