CVE-2026-56356

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 v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.3 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279	Mitigation Vendor Advisory
https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-trigger-node-custom-css-field	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n:2.14.0:::::node.js::

History

02 Jul 2026, 19:38

Type	Values Removed	Values Added
CPE		cpe:2.3:a:n8n:n8n:2.14.0:::::node.js:: cpe:2.3:a:n8n:n8n::::::node.js::*
References	~~() https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279 -~~	() https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279 - Mitigation, Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-trigger-node-custom-css-field -~~	() https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-trigger-node-custom-css-field - Third Party Advisory
First Time		N8n N8n n8n

30 Jun 2026, 23:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-30 23:17

Updated : 2026-07-02 19:38

NVD link : CVE-2026-56356

Mitre link : CVE-2026-56356

CVE.ORG link : CVE-2026-56356

JSON object : View

Products Affected

n8n

n8n

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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