CVE-2026-72766

n8n before 1.123.67, 2.x before 2.31.5, and 2.32.x before 2.32.1 contain a type confusion vulnerability in the Send Email node, which does not enforce that its message fields are strings. A crafted non-string value supplied from a workflow expression into the text or HTML body field can be interpreted by the underlying mail library (Nodemailer) as a file path or URL, allowing arbitrary local file disclosure and server-side request forgery (SSRF). Exploitation requires a pre-existing active workflow with an unauthenticated webhook, valid SMTP credentials configured on the node, and untrusted input mapped directly into the body field; this is not a default configuration.

• CWE-843

• https://github.com/n8n-io/n8n/security/advisories/GHSA-2x35-3fw4-9jr4Vendor Advisory, Mitigation
• https://www.vulncheck.com/advisories/n8n-before-arbitrary-file-read-via-send-email-nodeThird Party Advisory

Published

Aug 11, 2026

Last Modified

Aug 28, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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