CVE-2026-72766

Summary

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.

Affected Software

Weaknesses

• CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

References

• https://github.com/n8n-io/n8n/security/advisories/GHSA-2x35-3fw4-9jr4
• https://www.vulncheck.com/advisories/n8n-before-arbitrary-file-read-via-send-email-node

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