CVE-2026-72768: n8n before 2.32.1 SSRF Protection Bypass via MCP Client

Severity: high (CVSS 8.3 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: 2026-08-11 · updated 2026-10-29
Weakness: CWE-918

Description

n8n versions before 2.32.1 contain a server-side request forgery protection bypass vulnerability in the MCP Client node that allows authenticated users to bypass SSRF protections. Attackers can craft workflows that send requests to internal or blocked hosts without routing through SSRF protection, exposing internal services and reading responses back through the workflow.

Affected products

n8n-io n8n: from 2.31.0 before 2.31.5; 2.32.0 (and their updates) — fixed in 2.31.5
n8n-io n8n: from 2.32.0 before 2.32.1 — fixed in 2.32.1

How to fix

Upgrade to a fixed version: n8n-io n8n 2.31.5; n8n-io n8n 2.32.1. Check the vendor advisory for mitigations.

References

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