Summary

This out-of-band update includes fixes and improvements that are a part of the following update:

• October 14, 2025—KB5066836 (OS Build 14393.8519)

The following is a summary of the issues that this out-of-band update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.

• [Windows Server Update Services (WSUS)] Fixed: This update addresses a remote code execution (RCE) vulnerability that was identified in WSUS reporting web services. For more information about the security fix, see CVE-2025-59287.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For more information about security vulnerabilities, please refer to the new Security Update Guide website and the October 2025 Security Updates.

For more information about Windows Server 2016, see its update history page.

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types.

How to get this update

Before you install this update

To install any Windows Server 2016 cumulative update released on or after January 14, 2025, we recommend you first install the latest Servicing Stack Update (SSU). If your device or offline image does not have the latest SSU installed, you might not be able to install this update.

Caution Until you install the SSU, this update might not be offered to your device. To reduce your security risk, install the SSU as soon as possible.

• If you use Windows Update, the latest SSU (KB5066584) will be offered to you automatically. If the latest SSU is not installed, you might not be able to install this update.

• If you use Windows Update for Business, the latest SSU (KB5066584) will be offered to you automatically. If the latest SSU is not installed, you might not be able to install this update.

• If you use the Update Catalog, we recommend you download and install the latest SSU (KB5066584). If the latest SSU is not installed, you might not be able to install this update.

• If you are a Windows Server Update Services (WSUS) administrator, you must approve SSU KB5066584 and this update KB5070882.

For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

File information

A list of the files that are included in this update are provided in a CSV (Comma delimited) (*.csv) file. The file can be opened in a text editor such as Notepad or in Microsoft Excel.

Download the file information for this out-of-band update KB5070882 now.