| Component | n8n |
| Severity | medium (CVSS 5.4) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| Published (NVD) | 2026-06-30 |
| Last modified | 2026-07-02 |
| Affected versions | n8n < 1.123.27 n8n >= 2.0.0, < 2.13.3 n8n = 2.14.0 |
| Fixed in | 1.123.27, 2.13.3 |
| Weakness | CWE-79 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
1.123.27or later (or the patched release of your branch: 2.13.3). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-56356
- https://github.com/n8n-io/n8n/security/advisories/GHSA-3c7f-5hgj-h279
- https://www.vulncheck.com/advisories/n8n-stored-cross-site-scripting-in-chat-trigger-node-custom-css-field
Read more
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