Discourse is an open source discussion platform. In affected versions a request to create or update custom sidebar section can cause a denial of service. This issue has been patched in commit `52b003d915`. Users are advised to upgrade. There are no known workarounds for this vulnerability.
https://github.com/discourse/discourse/security/advisories/GHSA-gxqx-3q2p-37gm
https://github.com/discourse/discourse/commit/52b003d915761f1581ae2d105f3cbe76df7bf1ff