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Vulnerability · Published Sep 8, 2026 · Assigned by GitHub_M

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

Medium 5.9

In plain English

A medium-severity incorrect authorization in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.9Medium
Exploit odds (30 days)0.4%top 66.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
npmn8n2.38.1GHSA-cw9w-vv67-hf73
npmn8n2.37.7GHSA-cw9w-vv67-hf73

Affected products (as reported)

VendorProductVersions
n8n-io n8n < 2.37.7>= 2.38.0, < 2.38.1

Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N

References