CVE-2026-59207: n8n: "Allowed HTTP Request Domains" Restriction Bypass via AI Agents MCP Connector

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: 2026-07-09 · updated 2026-10-25
Weakness: CWE-693

Description

n8n is an open source workflow automation platform. Prior to 2.27.4 and 2.28.1, the AI Agents feature did not enforce the Allowed HTTP Request Domains restriction configured on credentials when an MCP tool was pointed at an arbitrary URL, allowing a member-level user with use-only access to a shared credential to send its secret to an external server they control. This issue is fixed in versions 2.27.4 and 2.28.1.

Affected products

n8n-io n8n: before 2.27.4; 2.28.0 — fixed in 2.27.4

How to fix

Upgrade to a fixed version: n8n-io n8n 2.27.4. Check the vendor advisory for mitigations.

References

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