CVE-2026-86073 n8n: Per-Resource OAuth Consent Bypass via Unbound Refresh Token Resource Substitution
Attackers can bypass OAuth consent checks to access unauthorized workflows by substituting resource parameters during token refresh.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-86073?
CVE-2026-86073 is a medium-severity authentication bypass vulnerability in N8n N8n, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-86073?
4 open source packages ship an affected version, including n8n. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
n8n npm | All versions | 2.37.7 |
n8n npm | All versions | 2.37.7 |
n8n npm | From 2.38.0 | 2.38.1 |
n8n npm | From 2.38.0 | 2.38.1 |
Products include N8n N8n.
How do I fix CVE-2026-86073?
Upgrade n8n to a fixed version for your release line: 2.37.7 or 2.38.1.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-86073 being exploited?
There is no known exploitation of CVE-2026-86073 in the wild and no public exploit code.
Other vulnerabilities in N8n N8n
- CVE-2025-68613 n8n Improper Control of Dynamically-Managed Code Resources
- CVE-2026-21877 n8n is vulnerable to Remote Code Execution via Arbitrary File Write
- CVE-2026-21858 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
- CVE-2026-1470 n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution
- CVE-2025-68668 n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node
Sources
Also known as GHSA-cw9w-vv67-hf73, MINI-vrxw-cgwf-7h86.