Windows Server · 2025 · Release · Out-of-band update
October 23, 2025—KB5070881 (OS Build 26100.6905) Out-of-band
- Release
- Cumulative update
- KB5070881 — Microsoft's article, opens in a new tab
Windows Server 2025: Current LTSC release
Microsoft's known issues — KB5070881
- Issue Known issue Active Directory domain controllers (DC) running on Windows Server 2025 and also running the schema master Flexible Single Master Operation (FSMO) role , will allow duplicate entries in attributes of schema objects. Commonly affected attributes include auxiliaryClass , possSuperiors , mayContain with values such as msExchBaseClass , msExchContainer , and msExchVirtualDirectoryFlags . When this occurs, Active Directory replication fails with a schema mismatch error, such as error 8418: The replication operation failed because of a schema mismatch between the servers involved." This issue can be observed when running Exchange Server setup forestprep and the schema master role for Active Direct Workaround: This issue is addressed KB5068861 . This issue is addressed in KB5068861 . After installing KB5070881 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. This functionality is temporarily removed to address the Remote Code Execution Vulnerability, CVE-2025-59287 . Windows Server 2025 users aren’t affected, and no action is required. To learn how this issue affects Windows 11, see the following: Windows 11, version 25H2 Windows 11, version 24H2 For machines that downloaded and installed this update : Machines that installed this update are temporarily "off the Hotpatch train" and will not be offered Hotpatch update
Known issues — reported on the forum
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