CVE-2026-85170: n8n before 1.123.73 Local File Read and SSRF via Gmail and Brevo nodes

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-03 · updated 2026-10-29
Weakness: CWE-20

Description

n8n versions before 1.123.73, 2.35.4, and 2.36.2 pass message content in the Gmail (v1) and Brevo nodes to the mail composer without verifying it is a string. An authenticated user able to run a workflow can supply an expression that resolves to an object carrying a path or href property, causing the composer to read a local file accessible to the n8n process or fetch an internal URL (SSRF) and attach the result to the outgoing message.

Affected products

n8n-io n8n: before 1.123.73; from 2.0.0 before 2.35.4; from 2.36.0 before 2.36.2 — fixed in 1.123.73, 2.35.4, 2.36.2
n8n-io n8n: before 1.123.73 — fixed in 1.123.73

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.73, 2.35.4, 2.36.2; n8n-io n8n 1.123.73. Check the vendor advisory for mitigations.

References

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