Duplicate Advisory: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview
This advisory has been withdrawn because it is a duplicate of GHSA-p3rg-hrf9-w9gj. This link is maintained to preserve external references.
n8n before 1.123.64, 2.x before 2.29.8, and before 2.30.1 contains a DOM-based cross-site scripting vulnerability in the HTML preview, which renders execution output into an iframe srcdoc without the sandbox attribute. A sanitizer bypass allows injected script to execute same-origin as the editor. When a victim opens the preview, the script can call authenticated APIs using the victim's session. An account with global:member privileges can exploit the issue.