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 links can inject arbitrary HTML tags when rendered through our Onebox engine. 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.
https://github.com/discourse/discourse/security/advisories/GHSA-j95w-5hvx-jp5w
https://github.com/discourse/discourse/commit/d78357917c6a917a8a27af68756228e89c69321c
https://github.com/discourse/discourse/commit/628b293ff53fb617b3464dd27268aec84388cc09