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Microsoft Windows Server 2025 Updates

Software Utilities Windows

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

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New Release every
20 days
Critical fixes
10
Security-related releases
100%

Risk factor
A total of 15 updates have been released for Windows Server 2025.

Smooth installs %
Minor issues %
Major issues %

Updates

Latest vendor release: Oct 26, 2026

Windows Server 2025 Logo

KB5134137 (OS Build 26100.33674) is a non-security out-of-band cumulative update for Windows Server 2025 that adds an updated trusted root certificate payload for devices unable to receive automatic certificate trust list updates. Reference IDs: KB5126645.

Security update Microsoft Windows Server 2025
Oct 26, 2026
OS Build 26100.33674
Security update Microsoft Windows Server 2025
Oct 26, 2026
OS Build 26100.33674
Windows Server 2025 Logo

KB5126646 (OS Build 26100.33650) adds Quick machine recovery, ReFS security controls, ML-KEM support for TLS 1.3, Secure Boot certificate deployment, and quality improvements for Windows Server 2025. Reference IDs: KB5126645.

Security update Microsoft Windows Server 2025
Oct 13, 2026
OS Build 26100.33650
Security update Microsoft Windows Server 2025
Oct 13, 2026
OS Build 26100.33650
Windows Server 2025 Logo

KB5129235 is a non-security out-of-band cumulative update for Windows Server 2025, OS Build 26100.33451. It fixes Remote Desktop Services instability after KB5122871 and resolves multichannel USB Audio Class 1.0 failures. Reference IDs: KB5122870, KB5070881, CVE-2025-59287.

Security update Microsoft Windows Server 2025
Sep 14, 2026
OS Build 26100.33451
Security update Microsoft Windows Server 2025
Sep 14, 2026
OS Build 26100.33451
Windows Server 2025 Logo

KB5122871 (OS Build 26100.33438) delivers the latest security fixes and quality improvements for Windows Server 2025, including updates from KB5120233. It also improves certificate compatibility, networking failover, Remote Desktop audio redirection, and Sysmon reliability. Reference IDs: KB5122870, CVE-2025-59287.

Security update Microsoft Windows Server 2025
Sep 8, 2026
OS Build 26100.33438
Security update Microsoft Windows Server 2025
Sep 8, 2026
OS Build 26100.33438
Windows Server 2025 Logo

KB5120233 for Windows Server 2025 (OS Build 26100.33296) includes the latest security fixes, non-security improvements from KB5099536, and a servicing stack update KB5120232. It also improves File Explorer, PQC certificate support, Secure Boot certificate deployment, and the emoji panel. Reference IDs: KB5070881, CVE-2025-59287.

Security update Microsoft Windows Server 2025
Aug 11, 2026
OS Build 26100.33296
Security update Microsoft Windows Server 2025
Aug 11, 2026
OS Build 26100.33296
Windows Server 2025 Logo

KB5099536 for Windows Server 2025 (OS Build 26100.33158) includes the latest security fixes, non-security improvements from KB5094125, and a servicing stack update KB5101372. It also adds PQC TLS 1.3 support, RDP SHA-2 thumbprints, and Secure Boot certificate deployment improvements. Reference IDs: CVE-2026-56155, CVE-2025-59287.

Security update Microsoft Windows Server 2025
Jul 14, 2026
OS Build 26100.33158
Security update Microsoft Windows Server 2025
Jul 14, 2026
OS Build 26100.33158
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
Jun 9, 2026
OS Build 26100.32995
Security update Microsoft Windows Server 2025
Jun 9, 2026
OS Build 26100.32995
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
May 12, 2026
OS Build 26100.32860
Security update Microsoft Windows Server 2025
May 12, 2026
OS Build 26100.32860
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
Apr 19, 2026
OS Build 26100.32698
Security update Microsoft Windows Server 2025
Apr 19, 2026
OS Build 26100.32698
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
Apr 14, 2026
OS Build 26100.32690
Security update Microsoft Windows Server 2025
Apr 14, 2026
OS Build 26100.32690
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
Mar 10, 2026
OS Build 26100.32522
Security update Microsoft Windows Server 2025
Mar 10, 2026
OS Build 26100.32522
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
Feb 10, 2026
OS Build 26100.32370
Security update Microsoft Windows Server 2025
Feb 10, 2026
OS Build 26100.32370
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
Jan 24, 2026
OS Build 26100.32236
Security update Microsoft Windows Server 2025
Jan 24, 2026
OS Build 26100.32236
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
Jan 17, 2026
OS Build 26100.32234
Security update Microsoft Windows Server 2025
Jan 17, 2026
OS Build 26100.32234
Windows Server 2025 Logo

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 update Microsoft Windows Server 2025
Jan 13, 2026
OS Build 26100.32230
Security update Microsoft Windows Server 2025
Jan 13, 2026
OS Build 26100.32230