Detections
Analytics
CVE-2026-27166
medium
Description
Discourse is an open source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1 and 2026.1.2, insufficient cleanup in the default Codepen allowed iframes value allows an attacker to trick a user into changing the URL of the main page. This issue has been fixed in versions 2026.3.0-latest.1, 2026.2.1 and 2026.1.2. To workaround this issue, remove Codepen from the list of allowed iframes.
References
https://github.com/discourse/discourse/security/advisories/GHSA-h653-cq78-vjj2
https://github.com/discourse/discourse/commit/c4762a4fac2f61f52f325396b11d3aeb955ea925