What’s Vulnerable › Vulnerabilities

CVE-2026-86073: n8n: Per-Resource OAuth Consent Bypass via Unbound Refresh Token Resource Substitution

• Severity: high (CVSS 7.6 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-863

Description

n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.1, the OAuth token endpoint bound an authorization code's first access token to the consented resource but did not bind its refresh token. Refreshing checked only that the requested resource was registered, not that it matched the original grant. An OAuth client approved for one workflow could substitute a different workflow URL in the resource parameter and obtain a valid token for an unapproved workflow accessible to the consenting user. This issue is fixed in versions 2.37.7 and 2.38.1.

Affected products

• n8n-io n8n: before 2.37.7; 2.38.0 — fixed in 2.37.7

How to fix

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

References

• https://github.com/n8n-io/n8n/commit/18458482861097a26f874f30ad7e8136e268475c
• https://github.com/n8n-io/n8n/commit/380788fd9a3264c83161e868026a98731d274d88
• https://github.com/n8n-io/n8n/pull/37122
• https://github.com/n8n-io/n8n/pull/37588
• https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7
• https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.1
• https://github.com/n8n-io/n8n/security/advisories/GHSA-cw9w-vv67-hf73

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