Vulnerability Description
n8n contains a stored cross-site scripting vulnerability in the Chat Trigger node's Custom CSS field due to a misconfiguration of the sanitize-html library. Affected releases are those before 1.123.27, the 2.0.0 through 2.13.2 line, and 2.14.0 (fixed in 1.123.27, 2.13.3, and 2.14.1). An authenticated user with permission to create or modify workflows can inject JavaScript that bypasses sanitization, resulting in stored XSS against any user who visits the public chat page.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| N8N | N8N | < 1.123.27 |
Related Weaknesses (CWE)
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279MitigationVendor Advisory
- https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-triThird Party Advisory
FAQ
What is CVE-2026-56356?
CVE-2026-56356 is a vulnerability with a CVSS score of 5.4 (MEDIUM). n8n contains a stored cross-site scripting vulnerability in the Chat Trigger node's Custom CSS field due to a misconfiguration of the sanitize-html library. Affected releases are those before 1.123.27...
How severe is CVE-2026-56356?
CVE-2026-56356 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56356?
Check the references section above for vendor advisories and patch information. Affected products include: N8N N8N.