CVE-2026-104939 NGINX Ingress Controller - Authentication Bypass

NGINX Ingress Controller contains an authentication bypass caused by mishandling HTTP responses from an OAuth IdP in externalAuth policy, letting remote attackers gain unauthenticated access to protected paths, exploit requires crafted OAuth response.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-303

Vendor fix

Update to the latest version of NGINX Ingress Controller.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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