EUVD-2026-13187

| CVE-2026-27166 MEDIUM
2026-03-19 GitHub_M
4.1
CVSS 3.1
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CVSS 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

Lifecycle Timeline

3
EUVD ID Assigned
Mar 19, 2026 - 21:00 euvd
EUVD-2026-13187
Analysis Generated
Mar 19, 2026 - 21:00 vuln.today
CVE Published
Mar 19, 2026 - 20:29 nvd
MEDIUM 4.1

Tags

XSS

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.

Analysis

Insufficient sanitization of Codepen iframe parameters in Discourse prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 allows authenticated attackers to manipulate users into changing the main page URL through social engineering. The vulnerability requires user interaction and network access but has no available patch, making disabling Codepen embeds the recommended mitigation.

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

21
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +20
POC: 0

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EUVD-2026-13187 vulnerability details – vuln.today
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