CVE-2026-86073
n8n: Per-Resource OAuth Consent Bypass via Unbound Refresh Token Resource Substitution
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.
INFO
Published Date :
Sept. 8, 2026, 5:18 p.m.
Last Modified :
Sept. 11, 2026, 6:07 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update n8n to version 2.37.7 or later.
- Update n8n to version 2.38.1 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-86073.
| URL | Resource |
|---|---|
| https://github.com/n8n-io/n8n/commit/18458482861097a26f874f30ad7e8136e268475c | Patch |
| https://github.com/n8n-io/n8n/commit/380788fd9a3264c83161e868026a98731d274d88 | Patch |
| https://github.com/n8n-io/n8n/pull/37122 | Issue Tracking |
| https://github.com/n8n-io/n8n/pull/37588 | Issue Tracking |
| https://github.com/n8n-io/n8n/releases/tag/[email protected] | Release Notes |
| https://github.com/n8n-io/n8n/releases/tag/[email protected] | Release Notes |
| https://github.com/n8n-io/n8n/security/advisories/GHSA-cw9w-vv67-hf73 | Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-86073 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-86073
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-86073 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-86073 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 11, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L Added CPE Configuration OR *cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* versions up to (excluding) 2.37.7 *cpe:2.3:a:n8n:n8n:2.38.0:*:*:*:*:node.js:*:* Added Reference Type GitHub, Inc.: https://github.com/n8n-io/n8n/commit/18458482861097a26f874f30ad7e8136e268475c Types: Patch Added Reference Type GitHub, Inc.: https://github.com/n8n-io/n8n/commit/380788fd9a3264c83161e868026a98731d274d88 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/n8n-io/n8n/pull/37122 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/n8n-io/n8n/pull/37588 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/n8n-io/n8n/releases/tag/[email protected] Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/n8n-io/n8n/releases/tag/[email protected] Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/n8n-io/n8n/security/advisories/GHSA-cw9w-vv67-hf73 Types: Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 09, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-86073', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-09T15:58:32.122740Z'} -
New CVE Received by [email protected]
Sep. 08, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-863 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/86xxx/CVE-2026-86073.json">CVE-2026-86073</a> Added Reference https://github.com/n8n-io/n8n/commit/18458482861097a26f874f30ad7e8136e268475c Added Reference https://github.com/n8n-io/n8n/commit/380788fd9a3264c83161e868026a98731d274d88 Added Reference https://github.com/n8n-io/n8n/pull/37122 Added Reference https://github.com/n8n-io/n8n/pull/37588 Added Reference https://github.com/n8n-io/n8n/releases/tag/[email protected] Added Reference https://github.com/n8n-io/n8n/releases/tag/[email protected] Added Reference https://github.com/n8n-io/n8n/security/advisories/GHSA-cw9w-vv67-hf73