December 9, 2025—KB5071543 (OS Build 14393.8688)
Applies To
Release Date:
12/9/2025
Version:
OS Build 14393.8688
Windows Secure Boot certificate expiration
Important: Secure Boot certificates used by most Windows devices are set to expire starting 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.
Windows updates do not install Microsoft Store application updates. If you are an enterprise user, see Microsoft Store apps - Configuration Manager. If you are a consumer user, see Get updates for apps and games in Microsoft Store.
Support for Windows Server 2016 will end in January 2027
After January 12, 2027, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows Server 2016. We recommend that you upgrade to a later version of Windows Server.
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Change date |
Change description |
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December 18, 2025 |
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December 12, 2025 |
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Summary
Applies to: Windows Server 2016
This security update includes fixes and improvements that are a part of the following update:
The following is a summary of the issues that this update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.
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[PowerShell 5.1] The Invoke-WebRequest command now includes a confirmation prompt with a security warning of a script execution risk. You can choose to continue or cancel the request. For additional details, see CVE-2025-54100 and KB5074596: PowerShell 5.1: Preventing script execution from web content.
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 December 2025 Security Updates.
For more information about Windows 10, version 1607, 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.
Known issues in this update
Symptoms
After installing this update, users might face issues with the Message Queuing (MSMQ) functionality. This issue also impacts clustered MSMQ environments under load. Due to this issue, users might encounter the following symptoms:
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MSMQ queues becoming inactive
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IIS sites failing with “Insufficient resources to perform operation” errors
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Applications unable to write to queues
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Errors such as "The message file 'C:\Windows\System32\msmq\storage*.mq' cannot be created” when creating message files
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Misleading logs, such as “There is insufficient disk space or memory", despite sufficient disk space and memory being available
This issue is caused by the recent changes introduced to the MSMQ security model and NTFS permissions on the C:\Windows\System32\MSMQ\storage folder. MSMQ users now require write access to this folder, which is normally restricted to administrators. As a result, attempts to send messages via MSMQ APIs might fail with resource errors.
Individuals using Windows Home or Pro editions on personal devices are very unlikely to experience this issue. This issue primarily affects enterprise or managed IT environments.
Resolution
This issue was resolved by the Windows out-of-band update released on and after December 18, 2025 (such as KB5074974). We recommend you install the latest update for your device as it contains important improvements and issue resolutions, including this one.
Applies to: Win 10 Ent LTSB 2016
This security update includes fixes and improvements that are a part of the following update:
The following is a summary of the issues that this update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.
-
[PowerShell 5.1] The Invoke-WebRequest command now includes a confirmation prompt with a security warning of a script execution risk. You can choose to continue or cancel the request. For additional details, see CVE-2025-54100 and KB5074596: PowerShell 5.1: Preventing script execution from web content.
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 December 2025 Security Updates.
For more information about Windows 10, version 1607, 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.
Known issues in this update
Symptoms
After installing this update, users might face issues with the Message Queuing (MSMQ) functionality. This issue also impacts clustered MSMQ environments under load. Due to this issue, users might encounter the following symptoms:
-
MSMQ queues becoming inactive
-
IIS sites failing with “Insufficient resources to perform operation” errors
-
Applications unable to write to queues
-
Errors such as "The message file 'C:\Windows\System32\msmq\storage*.mq' cannot be created” when creating message files
-
Misleading logs, such as “There is insufficient disk space or memory", despite sufficient disk space and memory being available
This issue is caused by the recent changes introduced to the MSMQ security model and NTFS permissions on the C:\Windows\System32\MSMQ\storage folder. MSMQ users now require write access to this folder, which is normally restricted to administrators. As a result, attempts to send messages via MSMQ APIs might fail with resource errors.
Individuals using Windows Home or Pro editions on personal devices are very unlikely to experience this issue. This issue primarily affects enterprise or managed IT environments.
Resolution
This issue was resolved by the Windows out-of-band update released on and after December 18, 2025 (such as KB5074974). We recommend you install the latest update for your device as it contains important improvements and issue resolutions, including this one.
How to get this update
Before you install this update
To install updates 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.
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If you use Windows Update, the latest SSU (KB5070247) will be offered to you automatically. If the latest SSU is not installed, you might not be able to install this update.
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If you use Windows Update for Business, the latest SSU (KB5070247) will be offered to you automatically. If the latest SSU is not installed, you might not be able to install this update.
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If you use the Update Catalog, we recommend you download and install the latest SSU (KB5070247). If the latest SSU is not installed, you might not be able to install this update.
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If you are a Windows Server Update Services (WSUS) administrator, you must approve SSU KB5070247 and this update KB5071543.
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.
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Available |
Next Step |
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This update will be downloaded and installed automatically from Windows Update and Microsoft Update. |
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Available |
Next Step |
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This update will be downloaded and installed automatically from Windows Update for Business in accordance with configured policies. |
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Available |
Next Step |
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To get the standalone package for this update, go to the Microsoft Update Catalog website. For information about how to download and install updates from the Update Catalog, see How to download updates that include drivers and hotfixes from the Windows Update Catalog. |
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Available |
Next Step |
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This update will automatically sync with Windows Server Update Services (WSUS) if you configure Products and Classifications as follows: Product: Windows 10 Classification: Security Updates |
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.
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