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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-86073
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-08 17:18:39 UTC
Updated2026-09-09 20:16:54 UTC
Descriptionn8n 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.

Risk And Classification

Primary CVSS: v4.0 5.9 MEDIUM from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.003200000 probability, percentile 0.247850000 (date 2026-09-10)

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED5.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
Active
Confidentiality
High
Integrity
Low
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA N8n-io N8n affected < 2.37.7 Not specified
CNA N8n-io N8n affected >= 2.38.0, < 2.38.1 Not specified

References

ReferenceSourceLinkTags
github.com/n8n-io/n8n/security/advisories/GHSA-cw9w-vv67-hf73 [email protected] github.com
github.com/n8n-io/n8n/commit/380788fd9a3264c83161e868026a98731d274d88 [email protected] github.com
github.com/n8n-io/n8n/releases/tag/[email protected] [email protected] github.com
github.com/n8n-io/n8n/pull/37122 [email protected] github.com
github.com/n8n-io/n8n/commit/18458482861097a26f874f30ad7e8136e268475c [email protected] github.com
github.com/n8n-io/n8n/pull/37588 [email protected] github.com
github.com/n8n-io/n8n/releases/tag/[email protected] [email protected] github.com
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