CVE-2026-56356CWE-79

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

Medium · published June 30, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
15.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00250 · 15.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-06-30T22:08Z
EPSS history
Timeline
  • 30 JUN 22:08Z
    n8n - Stored Cross-Site Scripting in Chat Trigger Node Custom CSS Field
    cvelistv5