### Storage Capacity and Volume Expansion Are Generally Available

[Storage capacity tracking](https://github.com/kubernetes/enhancements/issues/1472)
supports exposing currently available storage capacity via [CSIStorageCapacity objects](https://kubernetes.io/docs/concepts/storage/storage-capacity/#api)
and enhances scheduling of pods that use CSI volumes with late binding.

Also, please note:
- using `application/vnd.kubernetes.protobuf` as the media storage type for 1.6 is default but not required
- the ability to rollback to etcd2 can be preserved by setting the storage media type flag on `kube-apiserver`

  ```
  --storage-media-type application/json
  ```

  to continue to use `application/json` as the storage media type which can be changed to

### Feature

  - [Important Security Information](#important-security-information-1)
    - [CVE-2023-5528: Insufficient input sanitization in in-tree storage plugin leads to privilege escalation on Windows nodes](#cve-2023-5528-insufficient-input-sanitization-in-in-tree-storage-plugin-leads-to-privilege-escalation-on-windows-nodes)
  - [Changes by Kind](#changes-by-kind-7)
    - [API Change](#api-change-1)
    - [Feature](#feature-6)

  - [Important Security Information](#important-security-information-1)
    - [CVE-2023-5528: Insufficient input sanitization in in-tree storage plugin leads to privilege escalation on Windows nodes](#cve-2023-5528-insufficient-input-sanitization-in-in-tree-storage-plugin-leads-to-privilege-escalation-on-windows-nodes)
  - [Changes by Kind](#changes-by-kind-7)
    - [API Change](#api-change-1)
    - [Feature](#feature-6)

### Continued improvement of CSI

Before upgrading to Kubernetes 1.13, you must keep the following in mind:

- kube-apiserver

- GlusterFS in-tree storage driver which was deprecated at kubernetes 1.25 release has been removed entirely in 1.26. ([#112015](https://github.com/kubernetes/kubernetes/pull/112015), [@humblec](https://github.com/humblec)) [SIG API Machinery, Cloud Provider, Instrumentation, Node, Scalability, Storage and Testing]

      - [Cluster Lifecycle](#cluster-lifecycle)
      - [Network](#network)
      - [Scheduling](#scheduling)
      - [Storage](#storage)
      - [Windows](#windows)
  - [Deprecations and Removals](#deprecations-and-removals)
  - [Metrics Changes](#metrics-changes)
    - [Added metrics](#added-metrics)

### Storage

- Fixed scanning of failed iSCSI targets. ([#74306](https://github.com/kubernetes/kubernetes/pull/74306), [@jsafrane](https://github.com/jsafrane))