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CVE-2026-27166

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CVE-2026-27166

Published: Mar 19, 2026

Modified: Mar 21, 2026

PUBLISHED

CVSS v3.1

4.1

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.

VendorProductVersions

discourse

discourse

affected
< 2026.3.0-latest.1
affected
>= 2026.2.0-latest, < 2026.2.1
affected
>= 2026.1.0-latest, < 2026.1.2

Weaknesses (CWE)

CWE-80

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

References

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