AI agent vulnerability · n8n

GHSA-3c7f-5hgj-h279: n8n has XSS in Chat Trigger Node through Custom CSS

mediumCVSS 4.0 5.1 · 3.1 5.4

Impact An authenticated user with permission to create or modify workflows could inject malicious JavaScript into the Custom CSS field of the Chat Trigger node. Due to a misconfiguration in the sanitize-html library, the sanitization could be bypassed, resulting in stored XSS on the public chat page. Any user visiting the chat URL would be affected.

Published Mar 27, 2026 · Updated Apr 3, 2026

Affected packages

n8n

Ecosystem: npm
Affected: < 1.123.27
Fixed in: 1.123.27
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: = 2.14.0
Fixed in: 2.14.1
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.0.0-rc.0, < 2.13.3
Fixed in: 2.13.3
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

An authenticated user with permission to create or modify workflows could inject malicious JavaScript into the Custom CSS field of the Chat Trigger node. Due to a misconfiguration in the sanitize-html library, the sanitization could be bypassed, resulting in stored XSS on the public chat page. Any user visiting the chat URL would be affected.

Patches

The issue has been fixed in n8n versions 1.123.27, 2.13.3, and 2.14.1. Users should upgrade to one of these versions or later to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:

Limit workflow creation and editing permissions to fully trusted users only.
Disable the Chat Trigger node by adding @n8n/n8n-nodes-langchain.chatTrigger to the NODES_EXCLUDE environment variable.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Credited to JorianWoltjer, ioaniftimesei.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

More n8n vulnerabilities

All n8n entries