Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-27166

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.6%
CVSS Severity
CVSS v3 Score 4.1
Products affected by CVE-2026-27166


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