MC1285472
Prevent or fix issuesMajor changeAdmin impact
Take action: Out-of-band updates released for Windows Server to address two issues
Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.Microsoft asks admins to prevent or fix an issue. Read what it asks below and check the linked documentation; whether your tenant is affected is not known here.
What the notice says
Microsoft’s text, with source markup removedMicrosoft has released out-of-band (OOB) updates today, April 19, 2026, to address issues introduced by the April 2026 Windows security update. A limited number of Windows Server 2025 devices might experience failures installing the April 2026 security update (KB5082063). In addition, some versions of Windows Server may experience domain controllers restarting repeatedly after installing the April 2026 security update. To address these issues, Microsoft has released OOB updates for the Windows Server versions listed below. Note: The Windows Server 2025 OOB update (KB5091157) addresses both the installation failure issue and the domain controller restart issue. OOB updates released for other supported Windows Server versions address only the domain controller restart issue. For complete guidance and installation instructions, see the relevant KB articles: Standard Windows updates Windows Server 2025: KB5091157 (OS Build 26100.32698) Out-of-band Windows Server, version 23H2: KB5091571 (OS Build 25398.2276) Out-of-band Windows Server 2022: KB5091575 (OS Build 20348.5024) Out-of-band Windows Server 2019: KB5091573 (OS Build 17763.8647) Out-of-band Windows Server 2016: KB5091572 (OS Build 14393.9062) Out-of-band Windows hotpatch updates Windows Server 2025 Datacenter: Azure Edition: Hotpatch KB5091470 (OS Build 26100.32704) Out-of-band Windows Server 2022 Datacenter: Azure Edition: Hotpatch KB5091576 (OS Build 20348.5029) Out-of-band
- https://support.microsoft.com/help/5082063
- https://learn.microsoft.com/windows/release-health/status-windows-server-2025#4833msgdesc
- https://support.microsoft.com/help/5091157
- https://support.microsoft.com/topic/13ab53cc-ccc8-4a00-89d2-823b58fa03ec
- https://support.microsoft.com/help/5091571
- https://support.microsoft.com/topic/4a5a784e-e50a-4358-8093-b1654aecdbd1
- https://support.microsoft.com/topic/08263e6c-c20a-423f-8d75-9c6d77a0c75e
- https://support.microsoft.com/topic/5df74339-4bd0-4fd0-af74-45972f072abb
- https://support.microsoft.com/topic/b09952e2-f7e1-4af0-a479-ecf2c427af56
- https://support.microsoft.com/topic/5b2259b9-a15f-4cc4-b18f-f4f2c3b6b184
What changed
Between archive captures, newest firstThe archive supplies one version of this notice.
Linked documentation
Microsoft pages the notice links toThe notice links to no Microsoft Learn or Support page that this installation reads.
Related public evidence
No related evidence found in this installation's recent collection. This does not establish that no announcement exists.
Not confirmed here
What this page cannot tell you- Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.