Vulnerability · Published Jun 30, 2026 · Assigned by VulnCheck

CVE-2026-56356n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field

Medium 5.4

In plain English

A medium-severity cross-site scripting in n8n from n8n. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 83.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	1.123.27	GHSA-3c7f-5hgj-h279
npm	n8n	2.14.1	GHSA-3c7f-5hgj-h279
npm	n8n	2.13.3	GHSA-3c7f-5hgj-h279

Affected products (as reported)

Vendor	Product	Versions
n8n	n8n	0 – before 1.123.272.0.0-rc.0 – before 2.13.32.14.0 – before 2.14.1
n8n	n8n	2.14.0 – before 2.14.1
n8n	n8n	2.0.0-rc.0 – before 2.13.3

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-3c7f-5hgj-h279) vendor-advisory
VulnCheck Advisory: n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field third-party-advisory