check before: 2026-04-19
Product:
Windows, Windows Server
Platform:
Online, World tenant
Status:
Change type:
Admin impact
Links:
Details:
Microsoft 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
Change Category:
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Scope:
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Release Phase:
Created:
2026-04-20
updated:
2026-04-20
Task Type
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Docu to Check
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MS Preperations
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MS Urgency
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summary for non-techies**
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Direct effects for Operations**
Installation Failures
Limited number of Windows Server 2025 devices may fail to install the April 2026 security update, leading to potential downtime and service disruption.
- roles: System Administrators, IT Support Staff
- references: https://learn.microsoft.com/windows/release-health/status-windows-server-2025#4833msgdesc, https://support.microsoft.com/help/5082063
" target="_blank" rel="nofollow noopener noreferrer">https://support.microsoft.com/help/5082063
Domain Controller Restarts
Some versions of Windows Server may experience repeated restarts of domain controllers after the update, impacting authentication and access to resources.
- roles: Network Administrators, System Administrators
- references: https://learn.microsoft.com/windows/release-health/status-windows-server-2025#4833msgdesc, https://support.microsoft.com/help/5091157
User Access Issues
Frequent restarts of domain controllers can lead to user access issues, preventing users from logging in or accessing network resources.
- roles: End Users, Help Desk Staff
- references: https://learn.microsoft.com/windows/release-health/status-windows-server-2025#4833msgdesc, https://support.microsoft.com/help/5091571
Increased Support Tickets
The issues caused by the update may lead to an increase in support tickets as users report problems, straining IT resources.
- roles: IT Support Staff, System Administrators
- references: https://support.microsoft.com/help/5082063, https://support.microsoft.com/help/5091157
Operational Downtime
If the issues are not addressed promptly, there could be significant operational downtime affecting business processes and productivity.
- roles: Business Operations Managers, IT Managers
- references: https://learn.microsoft.com/windows/release-health/status-windows-server-2025#4833msgdesc, https://support.microsoft.com/help/5091571
Configutation Options**
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Opportunities**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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