CVE-2026-56356
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk7th percentile — higher than 7% of all known CVEs
Summary
n8n contains a stored XSS vulnerability in the Chat Trigger node's Custom CSS field due to a misconfiguration of the sanitize-html library. 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.
Risk Assessment
The risk involves arbitrary JavaScript execution in other users' browsers, potentially leading to session theft, data leakage, or admin account takeover.
Recommendation
Immediately upgrade n8n to version 1.123.27, 2.13.3, or 2.14.1 depending on your release line.
Original NVD description (English source)
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.