Discourse is an option source discussion platform. Prior to version 2.8.14 on the stable
branch and version 3.0.0.beta16 on the beta
and tests-passed
branches, pending post titles can be used for cross-site scripting attacks. Pending posts can be created by unprivileged users when a category has the "require moderator approval of all new topics" setting set. This vulnerability can lead to a full XSS on sites which have modified or disabled Discourse’s default Content Security Policy. A patch is available in versions 2.8.14 and 3.0.0.beta16.