CVE-2026-94197
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
Vulnerability in F5 NGINX Kubernetes Ingress Controller (NIC) when configured with ExternalAuth policy or Ingress external authentication. Client-supplied X-Forwarded-Prefix, X-Forwarded-URI, X-Original-URI, and X-Forwarded-Method headers are forwarded unsanitized into the internal authentication subrequest, allowing an unauthenticated remote attacker to spoof request attributes evaluated by the external authentication provider.
Risk Assessment
An attacker may gain unauthorized access to protected paths. This is a data plane issue only; no control plane exposure.
Recommendation
Upgrade NGINX NIC to a patched version. Additionally, consider sanitizing or filtering X-Forwarded-* headers at the proxy level before they reach authentication.
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Original NVD description (English source)
An authentication and authorization bypass vulnerability exists in F5 NGINX Kubernetes Ingress Controller (NIC) when configured with the `ExternalAuth` policy or Ingress external authentication. Client-supplied X-Forwarded-Prefix, X-Forwarded-URI, X-Original-URI, and X-Forwarded-Method routing and method headers are forwarded unsanitized into the internal authentication subrequest (handled by the NGINX auth_request directive). As a result, an unauthenticated, remote attacker may spoof request attributes evaluated by the external authentication provider. Impact: This vulnerability may allow remote attackers unauthenticated access to protected paths. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

