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.

INFO

Published Date :

2026-03-19T20:29:22.570Z

Last Modified :

2026-03-19T20:29:22.570Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-27166 vulnerability.

Vendors Products
Discourse
  • Discourse
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27166.

URL Resource
https://github.com/discourse/discourse/commit/c4762a4fac2f61f52f325396b11d3aeb955ea925 cve-icon cve-icon
https://github.com/discourse/discourse/security/advisories/GHSA-h653-cq78-vjj2 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact