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A DOM-Based Cross-Site Scripting (XSS) vulnerability in n8n allows an attacker to inject scripts into the HTML preview through an unsandboxed iframe srcdoc, enabling the injected script to run with the same origin as the editor; if a victim opens this compromised preview, the script can call authenticated APIs using their session, allowing an account with 'global:member' privileges to exploit this to gain unauthorized access or perform actions.