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Windows Server 2019 KB5101645

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KB5101645SecurityBug fixPerformance
๐Ÿ“… July 14, 2026๐Ÿ—‚ Operating Systems๐Ÿ“ฆ Windows Server 2019 โ†—๐Ÿ“œ Full changelog โ†—
โœฆ Editor's summary

Windows Server 2019 KB5101645 is the July 2026 cumulative security update. It delivers Microsoft's latest security fixes, improves Secure Boot and Remote Desktop security, and includes cumulative quality, reliability, and servicing improvements for supported Windows Server 2019 systems.

โš  Security impact
  • Includes Microsoft's July 2026 cumulative security updates.
  • Expands deployment of Microsoft Secure Boot certificates for eligible systems.
  • Adds SHA-2 certificate thumbprint support for trusted Remote Desktop publishers.
  • Includes security hardening for networking and core operating system components.

What's new

  • Updated Windows Server 2019 to OS Build 17763.9020.
  • Installed the July 2026 cumulative update (KB5101645).
  • Included Microsoft's latest cumulative security fixes.
  • Expanded Secure Boot certificate deployment for supported systems.
  • Added SHA-2 certificate thumbprint support for trusted Remote Desktop publishers.
  • Improved Windows Update servicing reliability.
  • Included cumulative quality, performance, and stability improvements.
More from Windows Server 2019
Windows Server 2019 17763.9121SecurityBug fixAug 11, 2026
Windows Server 2019 KB5094123SecurityBug fixPerformanceJun 9, 2026
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