In version 2.9.0.beta14 of Discourse, an open-source discussion platform, maliciously embedded urls can leak an admin's digest of recent topics, possibly exposing private information. A patch is available for version 2.9.0.beta15. There are no known workarounds for this issue.
https://github.com/discourse/discourse/security/advisories/GHSA-q9jp-xv4g-328f
https://github.com/discourse/discourse/commit/cf862e736565c6fa905c12b5dbe63d0bd056efb8