F5 NGINX Gateway Fabric up to 2.6.7 NGINX Configuration Generator clientID/cookieName/clientSecret code injection

Summaryinfo

A vulnerability was found in F5 NGINX Gateway Fabric up to 2.6.7. It has been declared as problematic. Impacted is an unknown function of the component NGINX Configuration Generator. Executing a manipulation of the argument clientID/cookieName/clientSecret can lead to code injection. The identification of this vulnerability is CVE-2026-66362. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in F5 NGINX Gateway Fabric up to 2.6.7. It has been declared as problematic. This vulnerability affects some unknown processing of the component NGINX Configuration Generator. The manipulation of the argument clientID/cookieName/clientSecret with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at my.f5.com. This vulnerability was named CVE-2026-66362 since 07/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are needed for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/02/2026). This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 2.6.8 eliminates this vulnerability.

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Productinfo

Type

• Web Server

Vendor

• F5

Name

• NGINX Gateway Fabric

Version

• 2.6.0
• 2.6.1
• 2.6.2
• 2.6.3
• 2.6.4
• 2.6.5
• 2.6.6
• 2.6.7

License

• commercial

Website

• Vendor: https://f5.com/

CPE 2.3info

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CPE 2.2info

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