Important
Free support for Windows 10 Enterprise 2016 LTSB and Windows Server 2016 will soon end. For information about the availability of Extended Security Updates (ESUs), see the End of support section.
Summary
This article lists the issues and quality improvements included in this out-of-band update.
Applies to: Windows Server 2016
This out-of-band update includes fixes and improvements that are a part of the following update:
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.
- [Remote Desktop Services (known issue)] Fixed: This update addresses an issue affecting Remote Desktop Services (RDS) after installing the September 2026 Windows security update (KB5123099). In affected environments, RDS might become unstable, causing RDP connection and sign-in failures or servers to become unresponsive during Remote Desktop configuration. Related tools, including Microsoft Management Console (MMC), RDS Licensing Diagnoser, File Explorer, and the Windows Update page, might also stop responding.
- [8-channel or 3D audio modes] Fixed: Some USB Audio Class 1.0 devices functioning as expected in standard stereo configurations failed when using multichannel audio features, including 8-channel or 3D audio modes. (Note: There are other audio symptoms not resolved in this OOB update. See the “Known issues in this update” section for more information.)
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, see the Security Update Guide website and the September 2026 Security Updates.
For more information about Windows Server 2016, see its update history page.
For information about Windows update terminology, see types of Windows updates and monthly quality update types.
Known issues in this update
USB Audio Class 1.0 devices with error Code 10 or no output
Symptoms
After installing the September 8, 2026, Windows security update, some USB Audio Class 1.0 devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms:
- The device displays an error in Device Manager: "This device cannot start (Code 10).”
- No audio output.
- Volume controls are unresponsive or remain at zero.
- Sound settings are unresponsive or unavailable.
This issue is limited to USB Audio Class 1.0 devices.
Resolution
Microsoft is working on a resolution and will update this documentation when more information is available.
How to get this update
Before you install this update
To install updates released on or after January 14, 2025, we recommend that 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 (KB5122874) 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 (KB5122874) 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 that you download and install the latest SSU (KB5122874). 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 KB5122874 and this update KB5123099. For general information about SSUs, see Servicing stack updates.
Get and install this update
To get and install this out-of-band update, use one of the following Windows and Microsoft release channels.
| Available | Next step |
|---|---|
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This update is available only from the Microsoft Update Catalog. |
File information
A list of the files included in this out-of-band update is provided in a CSV (Comma delimited) (*.csv) file. You can open the file in a text editor such as Notepad or in Microsoft Excel.
Note The English (United States) version of this software update might contain files for additional languages.
Download the file information for cumulative update KB5129239.
Related topics
Microsoft Store application updates
Windows updates do not install Microsoft Store application updates. Enterprise users should see Microsoft Store apps - Configuration Manager. Consumer users should see Get updates for apps and games in Microsoft Store.Windows Secure Boot certificate expiration
Important: Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
- End of support
Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes on the following end dates. For information about the availability of Extended Security Updates (ESUs), see Plan for Windows Server 2016 and Windows 10 2016 LTSB end of support.- Windows 10 Enterprise LTSB 2016 - October 13, 2026
- Windows 10 IoT Enterprise 2016 LTSB - October 13, 2026
- Windows Server 2016 - January 12, 2027