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.
Metrics
Affected Vendors & Products
References
History
Sat, 21 Mar 2026 05:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Fri, 20 Mar 2026 09:00:00 +0000
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| First Time appeared |
Discourse
Discourse discourse |
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| Vendors & Products |
Discourse
Discourse discourse |
Thu, 19 Mar 2026 20:45:00 +0000
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| 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. | |
| Title | Discourse vulnerable to HTML injection via prohibited iframe URLs | |
| Weaknesses | CWE-80 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-03-19T20:29:22.570Z
Updated: 2026-03-21T03:31:58.296Z
Reserved: 2026-02-18T00:18:53.962Z
Link: CVE-2026-27166
Updated: 2026-03-21T03:31:52.352Z
Status : Undergoing Analysis
Published: 2026-03-19T21:17:08.740
Modified: 2026-03-20T13:39:46.493
Link: CVE-2026-27166
No data.
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