Microsoft Windows Server 2025 Update Version OS Build 26100.32522

KB5078740 for Windows Server 2025 (OS Build 26100.32522) delivers the latest security fixes, non-security improvements from KB5075899, and a servicing stack update KB5078739. It also improves Secure Boot certificate targeting and hardware error reporting on newer server platforms. Reference IDs: CVE-2025-59287.

• Includes the latest security fixes for Windows Server 2025.
• Secure Boot: adds higher-confidence device targeting data to expand coverage for devices eligible to receive new Secure Boot certificates.
• WSUS synchronization error details are temporarily removed to address the Remote Code Execution vulnerability CVE-2025-59287.

• System services and reliability: improves support for newer server platforms with more hardware error reporting features, including systems with up to 64 MCA banks.
• Ensures Windows parses and configures all supported hardware error sources so errors are reported and handled correctly on modern servers such as newer AMD EPYC-based systems.

• WSUS does not display synchronization error details in its error reporting after installing KB5070881 or later updates.

• If previous updates are already installed, only the new updates in this package will be downloaded and installed.
• Secure Boot certificate updates are rolled out in a controlled and phased manner based on device update signals.
• Microsoft recommends reviewing the Windows Secure Boot certificate expiration guidance before June 2026.

Product Information

Vendor: Microsoft

Product: Windows Server 2025

Product type: Software

Application category: Utilities

Platform: Windows

Version: OS Build 26100.32522

Vendor information published: Mar 10, 2026

Original release notes: View on vendor site

Published on updatealert.io: Jun 3, 2026

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