Microsoft Windows Server 2022 Update Version OS Build 20348.5499

KB5120242 for Windows Server 2022 (OS Build 20348.5499) includes the latest security fixes, non-security improvements from KB5099540, and a servicing stack update KB5120241. It also expands Secure Boot certificate deployment coverage. Reference IDs: KB5070884, CVE-2025-59287.

• Includes the latest security fixes for Windows Server 2022.
• Secure Boot: adds additional high-confidence device targeting data to expand automatic deployment of new Secure Boot certificates.
• WSUS synchronization error details remain removed to address Remote Code Execution Vulnerability, CVE-2025-59287.

• Includes non-security quality improvements from KB5099540.
• Includes servicing stack update KB5120241 to improve update installation reliability.

• After installing KB5070884 or later, WSUS does not display synchronization error details in error reporting.

• If previous updates are already installed, only the new updates in this package will be downloaded and installed.
• Secure Boot certificate updates continue to be delivered through Windows Update in the coming months.
• The WSUS error details limitation is temporary and is tied to mitigation for CVE-2025-59287.

• Windows release health dashboard
  https://learn.microsoft.com/windows/release-health/
• Security Update Guide
  https://msrc.microsoft.com/update-guide/

Product Information

Vendor: Microsoft

Product: Windows Server 2022

Product type: Software

Application category: Utilities

Platform: Windows

Version: OS Build 20348.5499

Vendor information published: Aug 11, 2026

Original release notes: View on vendor site

Published on updatealert.io: Aug 12, 2026

Description: Server operating system for on-premises and hybrid workloads.