CVE-2026-56356

Medium

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.

SeverityMedium

CVSS5.4

Exploit probability—

Product

N8n

PublishedJun 30, 2026

First seenJun 30, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

n8n n8n1.123.27, 2.13.3 or later
n8n1.123.27, 2.14.1, 2.13.3 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279

Affected products

Product	Affected versions	Fixed in
n8n n8n	v < 1.123.27, 2.0.0 ≤ v < 2.13.3, 2.14.0	1.123.27, 2.13.3
n8nnpm	v < 1.123.27, 2.14.0 ≤ v < 2.14.1, 2.0.0-rc.0 ≤ v < 2.13.3	1.123.27, 2.14.1, 2.13.3

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