XSS in N8n
CVE-2026-56356
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (14.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- N8n — versions 0, 1.123.27, 2.0.0-rc.0
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279 (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-trigger-no… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56356?
- CVE-2026-56356 is a medium-severity vulnerability in N8n, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-06-30.
- How severe is CVE-2026-56356?
- Medium severity. CVSS v3 base score is 5.4 out of 10.