BaseFortify

Publication date: 2026-06-30

Last updated on: 2026-06-30

Assigner: VulnCheck

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 Scores

EPSS Scores

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Meta Information

Published

2026-06-30

Last Modified

2026-06-30

Generated

2026-07-01

AI Q&A

2026-07-01

EPSS Evaluated

N/A

NVD

CVE-2026-56356

EUVD

EUVD-2026-40444

Affected Vendors & Products

Vendor	Product	Version / Range
n8n	n8n	to 1.123.27 (exc)
n8n	n8n	From 2.0.0 (inc) to 2.13.2 (inc)
n8n	n8n	2.14.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability is a stored cross-site scripting (XSS) issue found in the n8n software, specifically in the Chat Trigger node's Custom CSS field. It occurs because of a misconfiguration in the sanitize-html library used by n8n. An authenticated user who has permission to create or modify workflows can inject malicious JavaScript code that bypasses the sanitization process. This malicious code is then stored and executed whenever any user visits the public chat page.

Impact Analysis

The impact of this vulnerability is that an attacker with certain permissions can inject malicious JavaScript into the application, which will be executed in the browsers of users who visit the affected public chat page. This can lead to unauthorized actions such as stealing user session data, performing actions on behalf of users, or delivering further malicious payloads. The vulnerability affects confidentiality and integrity but does not impact availability.

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