Improper Authentication in n8n - CVE-2026-126385
Published: November 9, 2026 / Updated: November 13, 2026
Vulnerability identifier: #VU163076
CSH Severity: Medium
CVSS v4: 8.4 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126385
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a low-privileged attacker to impersonate a victim at an OAuth provider through n8n workflows.
The vulnerability exists due to missing authentication binding in the OAuth2 credential callback on Enterprise instances configured with resolvable OAuth2 credentials. A low-privileged attacker with access to such a credential can send its authorization URL to a victim who completes consent without an active n8n session, storing the victim's provider tokens under the attacker's identity.
Affected software
n8n
How to mitigate CVE-2026-126385
Install security update from vendor's website.
n8n - addressed in versions 2.45.5, 2.46.1, 3.0.1