* Exec and portforward actions over SPDY now properly handle redirects sent by the Kubelet ([#44451](https://github.com/kubernetes/kubernetes/pull/44451), [@ncdc](https://github.com/ncdc))

A security issue was discovered in kube-apiserver that could allow an attacker controlled aggregated API server to redirect client traffic to any URL.  This could lead to the client performing unexpected actions as well as leaking the client's credentials to third parties. 

* [beta] SelfSubjectRulesReview, an API that lets a user see what actions they can perform with a namespace, has been added to the authorization.k8s.io API group. This bulk query is intended to enable UIs to show/hide actions based on the end user, and for users to quickly reason about their own permissions.

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* Add --quiet to hide the 'waiting for pods to be running' message in kubectl run ([#28801](https://github.com/kubernetes/kubernetes/pull/28801), [@janetkuo](https://github.com/janetkuo))
* Controllers doesn't take any actions when being deleted. ([#27438](https://github.com/kubernetes/kubernetes/pull/27438), [@gmarek](https://github.com/gmarek))

  * Authenticated users are decorated with a 'system:authenticated' group.
  * **IMPORTANT**: See Action Required for important actions related to this change.

- kubeadm: increased the verbosity of API client dry-run actions during the subcommands "init", "join", "upgrade" and "reset". It also allowed dry-run on 'kubeadm join' even if there was no existing cluster by utilizing a faked, in-memory cluster-info ConfigMap. ([#126776](https://github.com/kubernetes/kubernetes/pull/126776),...

* Disable anonymous auth on kubelet ([#41919](https://github.com/kubernetes/kubernetes/pull/41919), [@Cynerva](https://github.com/Cynerva))
* Fix shebangs in charm actions to use python3 ([#42058](https://github.com/kubernetes/kubernetes/pull/42058), [@Cynerva](https://github.com/Cynerva))

 ([#64792](https://github.com/kubernetes/kubernetes/pull/64792), [@luxas](https://github.com/luxas))...

  Added `validationActions` to `ValidatingAdmissionPolicyBinding`, enabling validation failures to be handled by any combination of the warn, audit and deny enforcement actions. ([#115973](https://github.com/kubernetes/kubernetes/pull/115973), [@jpbetz](https://github.com/jpbetz))