CVE-2026-86073 — n8n: Per-Resource OAuth Consent Bypass via Unbound Refresh Token Resource Substitution
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 resour…
Published: 2026-09-08 · CVSS: 5.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7