A security issue was discovered in ingress-nginx where an actor with permission to create Ingress objects (in the `networking.k8s.io` or `extensions` API group) can bypass annotation validation to inject arbitrary commands and obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.
https://groups.google.com/g/kubernetes-security-announce/c/a1__cKjWkfA
https://github.com/kubernetes/kubernetes/issues/126744