Windows Server 2019 17763.9121
Windows Server 2019 Build 17763.9121 (KB5120238) is the August 2026 cumulative security update. It delivers Microsoft's latest security protections together with cumulative quality and reliability improvements for Windows Server 2019. The update raises the OS build to 17763.9121 and should be prioritized on supported production servers after standard compatibility testing.
- Includes the August 2026 Microsoft security updates for Windows Server 2019.
- Addresses security vulnerabilities affecting Windows operating system components as part of Microsoft's monthly security servicing.
- Includes previously released security fixes because Windows Server cumulative updates are cumulative.
- Organizations should prioritize deployment to maintain protection against known Windows vulnerabilities.
What's new
Windows Server 2019 Build 17763.9121 (KB5120238) is the August 2026 cumulative security update for Windows Server 2019.
What's new- Includes the latest Microsoft security fixes released as part of the August 2026 security update cycle.
- Provides cumulative quality and reliability improvements for Windows Server 2019.
- Includes previously released security and quality fixes because Windows Server updates are cumulative.
- Includes servicing improvements designed to maintain operating system security and reliability.
Organizations running Windows Server 2019 should deploy KB5120238 after standard compatibility and application testing. Because this is a cumulative security update, timely deployment is recommended to protect systems against vulnerabilities addressed by Microsoft's August 2026 security updates.
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