PT-2026-88500 · Git+3 · N8N
CVE-2026-86084
·
Published
2026-09-08
·
Updated
2026-09-11
CVSS v4.0
6.0
Medium
| Vector | AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N |
Impact
The public OIDC login and callback endpoints ran the full flow whether or not OIDC was the instance's active, enabled authentication method, so turning OIDC off in Settings did not stop it issuing sessions. An administrator who disabled the provider still had a working login route. The patch requires OIDC to be the enabled, active authentication method before either endpoint starts the flow or issues a session.
The issue affects n8n Enterprise instances where OIDC was configured at least once and subsequently disabled.
Patches
The issue has been fixed in n8n versions 1.123.76, 2.37.7, and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability.
Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Disable or revoke the corresponding application or client at the IdP level to prevent the OIDC flow from completing.
- Restrict network-level access to the n8n instance to trusted users only.
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
Exploit
Fix
Authentication Bypass Using an Alternate Path or Channel
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Weakness Enumeration
Related Identifiers
Affected Products
N8N