CVE-2026-86074: n8n: Instance AI Credential Setup Accepts Unvalidated Probe URL from Fetched Content

Severity: high (CVSS 7.1 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: 2026-09-08 · updated 2026-09-11
Weakness: CWE-918

Description

n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the Instance AI credential setup flow accepted a credential test or verification URL without checking that it matched the workflow node's origin. Attacker-controlled fetched content could influence that URL after a user injected it into the setup flow, causing authenticated requests, redirects, or probes to reach another origin. The affected logic includes packages/@n8n/instance-ai/src/tools/workflows/credential-utils.ts and the extractServiceOrigin origin derivation. This issue is fixed in versions 2.37.7 and 2.38.2.

Affected products

n8n-io n8n: before 2.37.7; from 2.38.0 before 2.38.2 — fixed in 2.37.7, 2.38.2

How to fix

Upgrade to a fixed version: n8n-io n8n 2.37.7, 2.38.2. Check the vendor advisory for mitigations.

References

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