Microsoft Windows Server out-of-band updates (April 2026)
Security Patch Release
Summary
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Microsoft released out-of-band (OOB) updates for Windows Server after the April 2026 security updates triggered KB5082063 installation failures and domain controller restart loops, creating availability risk for server infrastructure. The emergency fixes cover Windows Server 2025, 23H2, 2022, 2019, and 2016, with Azure Edition hotpatch releases also issued for supported cloud builds. KB5091157 for Windows Server 2025 addresses both defects, while the other supported releases focus on the LSASS crash-driven restart issue.
Related Happenings
Microsoft Windows Server 2016 domain controller discovery failure after KB5087537
Service Disruption
First: 26.05.2026 10:41
Last: 26.05.2026 10:41
Sources 1
About this happening:
Microsoft confirmed a **known issue** in **Windows Server 2016** after **KB5087537** that can prevent **domain controller discovery**, disrupting administrative operations and app...
Microsoft Windows Server 2016 domain controller discovery failure after KB5087537
Service DisruptionAbout this happening: Microsoft confirmed a **known issue** in **Windows Server 2016** after **KB5087537** that can prevent **domain controller discovery**, disrupting administrative operations and app...
Microsoft Windows Update restricted-network download failure
Service Disruption
First: 19.05.2026 14:22
Last: 19.05.2026 14:22
Sources 1
About this happening:
Microsoft's **Windows Update** is failing in **restricted network environments** after the **January 2026 optional non-security preview updates**, leaving affected systems unable...
Microsoft Windows Update restricted-network download failure
Service DisruptionAbout this happening: Microsoft's **Windows Update** is failing in **restricted network environments** after the **January 2026 optional non-security preview updates**, leaving affected systems unable...
Microsoft Windows 11 KB5089549 cumulative update
Security Patch Release
First: 18.05.2026 11:33
Last: 18.05.2026 11:33
Sources 1
About this happening:
Microsoft's **KB5089549** **Windows 11** security update is failing to install on some systems, forcing affected devices to roll back during reboot. The problem is tied to a nearl...
Microsoft Windows 11 KB5089549 cumulative update
Security Patch ReleaseAbout this happening: Microsoft's **KB5089549** **Windows 11** security update is failing to install on some systems, forcing affected devices to roll back during reboot. The problem is tied to a nearl...
Microsoft adds Cloud-Initiated Driver Recovery for Windows Update driver rollbacks
Security Tool/Service
First: 15.05.2026 15:29
Last: 15.05.2026 15:29
Sources 1
About this happening:
Microsoft is adding **Cloud-Initiated Driver Recovery** to **Windows Update**, giving it a remote rollback control for **problematic Windows drivers**. The capability reduces how...
Microsoft adds Cloud-Initiated Driver Recovery for Windows Update driver rollbacks
Security Tool/ServiceAbout this happening: Microsoft is adding **Cloud-Initiated Driver Recovery** to **Windows Update**, giving it a remote rollback control for **problematic Windows drivers**. The capability reduces how...
Microsoft Windows Autopatch fix for EU restricted driver update deployment bug
Security Tool/Service
First: 13.05.2026 17:36
Last: 13.05.2026 17:36
Sources 1
About this happening:
**Microsoft** fixed a **Windows Autopatch** service bug that let **restricted driver updates** reach some managed devices in the **EU**, bypassing admin approval controls and crea...
Microsoft Windows Autopatch fix for EU restricted driver update deployment bug
Security Tool/ServiceAbout this happening: **Microsoft** fixed a **Windows Autopatch** service bug that let **restricted driver updates** reach some managed devices in the **EU**, bypassing admin approval controls and crea...
Timeline
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20.04.2026 11:30 3 articles · 1mo ago
Microsoft discloses Windows Server OOB fixes for KB5082063 and LSASS issues
Initial DisclosureMicrosoft said it released out-of-band updates for affected Windows Server releases after the April 2026 security updates caused KB5082063 installation failures on Windows Server 2025 and restart loops on domain controller systems when LSASS crashed; Microsoft also warned that some Windows Server 2025 devices can boot into BitLocker recovery after KB5082063.
Show sources
- Microsoft releases emergency updates to fix Windows Server issues — www.bleepingcomputer.com — 20.04.2026 11:30
- Microsoft releases emergency updates to fix Windows Server issues — www.bleepingcomputer.com — 20.04.2026 11:30
- Microsoft: Some Windows servers enter reboot loops after April patches — www.bleepingcomputer.com — 17.04.2026 10:59