[German]On April 8, 2025 (second Tuesday of the month, Patchday at Microsoft), various cumulative updates were released for the supported versions of Windows Server. Below I have extracted the provided updates along with some details for these Windows Server versions (from Windows Server 2012 to 2025). The security fixes relevant for Windows Server are described in the blog post Microsoft Security Update Summary (April 8, 2025).
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Updates for Windows Server 2025
A list of updates for Windows Server 2025 can be found on this Microsoft website. The cumulative update KB5055523 has been released for Windows Server 2025, which raises the OS build to 20348.3775. The update contains security patches and the following fixes:
- [IFilters] New! Windows Search runs IFilters in Less Privileged App Containers (LPAC). LPACs are like app containers, but they minimize permissions by default. Processes running in LPACs only access necessary resources and don't have access to sensitive system components and data. This mitigates the damage from a compromised process.
- [Input Method Editor (IME)] New! After you install this update, the IME toolbar will hide when apps are in full screen mode. This only occurs when the IME toolbar is active, and you type Chinese or Japanese characters,
- [Narrator] New! Narrator scan mode now includes new functions. Skip past links (N) lets you navigate directly to text after a link, useful for long emails, articles, or wiki pages. Jump to lists (L) quickly accesses lists in web pages or documents. To use these features, turn on Narrator (Windows logo key + Ctrl + Enter), then activate scan mode with Caps lock + Spacebar. Scan mode is usually on by default on most web pages.
- [Task Manager]
- New! The Disconnect and Logoff dialogs now support dark mode and text scaling.
- New! The Performance section now shows the type for each disk.
- Fixed: When you select Automatically hide the taskbar, the search box appears as an icon rather than a search box.
- Fixed: The Users page might cause Task Manager to stop responding when you use the keyboard.
- [Authentication] This update addresses an issue affecting machine password rotation in the Identity Update Manager certificate/Public Key Cryptography for Initial Authentication (PKNIT) path. This issue occurred particularly when Kerberos was used and Credential Guard was enabled, potentially causing user authentication problems. The feature Machine Accounts in Credential Gurad, which is dependent on password rotation via Kerberos, has also been disabled, until a permanent fix is made available.
- [Daylight Saving Time (DST)] Update for the Aysen region in Chile to support the government DST change order in 2025. For more info about DST changes, see the Daylight Saving Time & Time Zone Blog.
- [Deployment Image Servicing and Management (DISM)] Fixed: The StartComponentCleanup task doesn't work properly. It stops at 71% and shows error 6842.
- [JPG files] Fixed: You cannot use an API to find rotation information.
- [Mouse] Fixed: When using the show location pointer feature by pressing the CTRL key, the circles might appear small on some displays.
- [PcaUiArm] This update addresses an issue affecting the PcaUiArmUpdate feature, which results in unexpected behavior in specific scenarios.
- [PowerShell] Fixed: The Get-WindowsCapability command sometimes stops responding. Then you must restart your PC.
- [Windows Subsystem for Linux (WSL)] Fixed: It stops working and will not start up.
- [Windows Update] Fixed: When you install an update, you might get error 0x800f0905.
This update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog and via WSUS and WUfB. The latest Windows Servicing Stack Update is integrated in the patch. Any problems caused by the update (Citrix) and installation requirements are listed in the support article.
Updates for Windows Server 2022/23H2
The following updates are available for Windows Server 2022 and Windows Server 23H2.
Update KB5055527 for Windows Server 23H2
A list of updates for Windows Server 23H2 can be found on this Microsoft website. The cumulative update KB5055527 has been released for Windows Server 23H2, which raises the OS build to 25398.1551. The update contains security patches and the following fixes.
- [Daylight Saving Time (DST)] Update for the Aysen region in Chile to support the government DST change order in 2025. For more info about DST changes, see the Daylight Saving Time & Time Zone Blog.
This update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog and via WSUS and WUfB. The latest Windows Servicing Stack Update is integrated in the patch. Any problems caused by the update (Citrix) and installation requirements are listed in the support article.
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Update KB5055526 for Windows Server 2022
A list of updates for Windows Server 2022 can be found on this Microsoft website. The cumulative update KB5055526 has been released for Windows Server 2022, which raises the OS build to 20348.3454. The update contains security patches and the following fixes
- [Daylight Saving Time (DST)] Update for the Aysen region in Chile to support the government DST change order in 2025. For more info about DST changes, see the Daylight Saving Time & Time Zone Blog.
This update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog and via WSUS and WUfB. The current Windows Servicing Stack Update is integrated in the patch. Any problems caused by the update and installation requirements are listed in the support article.
Updates for Windows Server 2016/2019
A list of updates for Windows Server 2016 and 2019 can be found on this Microsoft website. I have extracted the relevant update information below.
Update KB5055519 for Windows Server 2019
Cumulative Update KB5055519 is not only available for Windows 10 2019 Enterprise LTSC etc., but also for Windows Server 2019. The update contains security fixes, no bug fixes are listed in the support article.
The update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog, via WSUS and WUfB. Microsoft has also updated the Service Stack Update (SSU). Please note the installation sequence described in the support article and, if applicable, the notes on further requirements and any existing problems.
Update KB5055521 for Windows Server 1607
Cumulative Update KB5055521 is not only available for Windows 10 2016 Enterprise LTSC, but also for Windows Server 2016. The update contains security fixes, no bug fixes are listed in the support article.
The update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog, via WSUS and WUfB. Microsoft has also updated the Service Stack Update (SSU). Please note the installation requirements described in the support article and any information on existing problems.
Updates for Windows Server 2012 / R2
Windows Server 2012/R2 will no longer be supported in October 2023 and will only receive updates with an ESU license. Please note the information on the installation sequence for Windows Server that Microsoft provides in the KB articles.
Update KB5055557 for Windows Server 2012 R2
The update history for Windows Server 2012 R2 can be found on this Microsoft page. Update KB5055557 (Monthly Rollup for Windows Server 2012 R2) has been released for Windows Server 2012 R2 for systems with an ESU license. The update eliminates various vulnerabilities and brings the following fixes.
- [Daylight Saving Time (DST)] Update for the Aysen region in Chile to support the government DST change order in 2025. For more information about DST changes, see the Daylight Saving Time & Time Zone Blog.
This update is automatically downloaded and installed by Windows Update in Windows Server 2012 R2, but is also available in the Microsoft Update Catalog and via WSUS. Details on fixes and any known problems in connection with the update are listed in the support article.
There is no security-only update for Windows Server 2012 R2.
Update K5055581 for Windows Server 2012
The update history for Windows Server 2012 can be found on this Microsoft page. Update KB5055581 (Monthly Rollup for Windows Server 2012) has been released for Windows Server 2012 with ESU license. It contains unspecified security patches and brings the following bug fixes.
- [Internal Windows OS] Miscellaneous security improvements were made to internal Windows OS functionality. No additional issues are documented for this release.
This update is available in the Microsoft Update Catalog and via WSUS. In the case of a manual installation, the latest Servicing Stack Update (SSU) must be installed beforehand – although this SSU can no longer be uninstalled. Problems in connection with the update are listed in the KB article.
There is no security-only update for Windows Server 2012.
If in doubt, details on the above updates can be found in the respective Microsoft KB articles.
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