CVE-2026-66362

Summary

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

Weaknesses

• CWE-76: CWE-76

Workarounds

As this attack is conducted by authenticated users with Kubernetes role-based access control (RBAC) write access to the affected CRDs, the only complete mitigation is to restrict that access to fully trusted administrators only.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://my.f5.com/manage/s/article/K000162600

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