n8n — Xss (CVE-2026-54303)
Date: 2026-06
Affected: n8n/n8n
Attack vector: xss
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-54303
CWE: CWE-79
CVSS: 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)

n8n is an open source workflow automation platform. Prior to 2.24.0, an endpoint in the Meta and Microsoft Teams trigger nodes reflects a query parameter into the HTTP response without sanitization or Content-Security-Policy headers, enabling reflected XSS in the n8n origin when a logged-in user visits a crafted URL. This vulnerability is fixed in 2.24.0.


Mitigations:

Architectural layers (MAESTRO):