CVE-2026-66362: NGF vulnerability
Description: When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in the NGINX configuration generator component of NGINX Gateway Fabric. User-supplied string values from the Authentication Filter Custom Resource Definition clientID or cookieName fields, or in the clientSecret field of a Secret referenced by an Authentication Filter, are rendered directly into NGINX configuration templates without sanitization or escaping.
Impact: An authenticated attacker with permission to create or modify these resources may craft values that inject arbitrary NGINX configuration directives. This is a control plane issue; there is no data plane exposure.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this vulnerability?
An attacker must already be authenticated and have permission to create or modify Authentication Filter resources or a Secret referenced by an Authentication Filter. The affected inputs are the Authentication Filter clientID and cookieName fields and the referenced Secret's clientSecret field.
Is traffic through the data plane directly exposed?
No. This is a control plane issue, and the provided information states that there is no data plane exposure.
What should teams restrict while remediation is pending?
Restrict permissions to create or modify Authentication Filters and Secrets referenced by them to trusted administrators. Review these resources for untrusted or unexpected values in clientID, cookieName, and clientSecret fields, since those values can be rendered into NGINX configuration templates without sanitization or escaping.