Microsoft Windows Server 2025 Updates

Here you will find all software, firmware, and hardware updates from Microsoft Windows Server 2025.

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New Release every
18 days
Critical fixes
9
Security-related releases
100%

Risk factor
A total of 9 updates have been released for Windows Server 2025.

Smooth installs %
Minor issues %
Major issues %

Updates

Last updated: 06/10/2026

KB5094125 updates Windows Server 2025 to OS Build 26100.32995 with security fixes, quality improvements, and non-security updates from KB5087539. It also adds DNS over HTTPS for DNS Server and includes Secure Boot and Windows Update reliability fixes. Reference IDs: KB5082063, KB5070881, CVE-2025-59287.

security Microsoft Windows Server 2025
06/09/2026
OS Build 26100.32995
security Microsoft Windows Server 2025
06/09/2026
OS Build 26100.32995

KB5087539 for Windows Server 2025 (OS Build 26100.32860) delivers security fixes, quality improvements, Secure Boot rollout changes, and new AD CS post-quantum signature support. It also includes the servicing stack update KB5089717. Reference IDs: KB5082063, KB5091157, CVE-2025-59287.

security Microsoft Windows Server 2025
05/12/2026
OS Build 26100.32860
security Microsoft Windows Server 2025
05/12/2026
OS Build 26100.32860

KB5091157 is a non-security out-of-band update for Windows Server 2025, OS Build 26100.32698. It fixes Active Directory startup/authentication issues on some domain controllers and resolves failures installing KB5082063.

security Microsoft Windows Server 2025
04/19/2026
OS Build 26100.32698
security Microsoft Windows Server 2025
04/19/2026
OS Build 26100.32698

KB5082063 for Windows Server 2025 (OS Build 26100.32690) delivers security fixes, quality improvements, and non-security updates from KB5078740. It also adds Secure Boot rollout changes, Kerberos authentication updates related to CVE-2026-20833, and vulnerable driver blocklist hardening.

security Microsoft Windows Server 2025
04/14/2026
OS Build 26100.32690
security Microsoft Windows Server 2025
04/14/2026
OS Build 26100.32690

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.

security Microsoft Windows Server 2025
03/10/2026
OS Build 26100.32522
security Microsoft Windows Server 2025
03/10/2026
OS Build 26100.32522

KB5075899 (OS Build 26100.32370) is a cumulative update for Windows Server 2025 with the latest security fixes, quality improvements, and selected non-security updates from prior preview releases. It also includes new DNS Server preview features and a servicing stack update, KB5075898. Reference IDs: CVE-2025-59287.

security Microsoft Windows Server 2025
02/10/2026
OS Build 26100.32370
security Microsoft Windows Server 2025
02/10/2026
OS Build 26100.32370

KB5078135 updates Windows Server 2025 to OS Build 26100.32236. This cumulative out-of-band update includes prior security fixes plus a file system fix for apps hanging or erroring when using cloud storage such as OneDrive or Dropbox.

security Microsoft Windows Server 2025
01/24/2026
OS Build 26100.32236
security Microsoft Windows Server 2025
01/24/2026
OS Build 26100.32236

KB5077793 is an out-of-band cumulative update for Windows Server 2025 (OS Build 26100.32234). It includes January 13, 2026 security update KB5073379 content plus a fix for Remote Desktop sign-in failures after that update. Reference IDs: KB5072725, CVE-2025-59287, KB5078135.

security Microsoft Windows Server 2025
01/17/2026
OS Build 26100.32234
security Microsoft Windows Server 2025
01/17/2026
OS Build 26100.32234

KB5073379 for Windows Server 2025 installs the January 13, 2026 cumulative update for OS Build 26100.32230, including security fixes, quality improvements, and changes from the December preview. It also adds Secure Boot targeting data, hardens credential autofill behavior, and removes legacy modem drivers.

security Microsoft Windows Server 2025
01/13/2026
OS Build 26100.32230
security Microsoft Windows Server 2025
01/13/2026
OS Build 26100.32230