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CVE-2026-72766 – Arbitrary Local File Disclosure & SSRF – n8n before 1.123.67, 2.x before 2.31.5, an

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Summary

CVE-2026-72766 is a type confusion vulnerability (CWE-843) in the Send Email node of n8n, the workflow automation platform. Crafted non-string values from workflow expressions are passed to the underlying mail library, which interprets them as file paths or URLs, enabling arbitrary local file disclosure and server-side request forgery (SSRF). It is rated High severity (CVSS 8.2).

Technical details

  • Root cause: The Send Email node does not validate that message body fields (text and HTML) are strings before passing them to the underlying mail library (Nodemailer). Non-string values are then interpreted as file paths or URLs.
  • Trigger conditions: Requires an active workflow with an unauthenticated webhook, valid SMTP credentials configured on the Send Email node, and untrusted input mapped directly into the text or HTML body fields.
  • Attack vector: Network. A remote, unauthenticated attacker supplies crafted input via the exposed webhook.
  • Impact: Arbitrary local file disclosure on the n8n host and server-side request forgery. High confidentiality impact; no integrity or availability impact.

Affected software

  • n8n < 1.123.67
  • n8n 2.x < 2.31.5
  • n8n 2.32.x < 2.32.1

Severity

  • CVSS 8.2 (High)
  • CVSS v4.0 vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade to n8n 1.123.67, 2.31.5, or 2.32.1 (or later).
  • If no patch can be applied:
    • Audit workflows for Send Email nodes that map untrusted data directly into the text or HTML body fields.
    • Restrict public webhook access using network or reverse-proxy controls.
    • Limit workflow creation and editing to trusted users only.
    • Note: these workarounds provide only short-term protection and do not fully remediate the risk.

References

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