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The Update Bureau

Monthly Patch Briefing

February 2026

37 updates released this month .

Updates, page 2

Updates, page 2:
  • Exchange Server · CU14
    Exchange Server 2019 CU14 Exchange Server 2019 CU14 ESU only Security update
    KB5074994

    Spoofing flaw needs a separate mitigation step

    The update addresses a spoofing vulnerability in Exchange Server, but the CVE bulletin's mitigation instructions are also needed. Only organizations enrolled in the Extended Security Update program are eligible.

    Build 15.2.1544.39
    Security 1 CVE
    Replaced by KB5094142 →
  • Exchange Server · CU23
    Exchange Server 2016 CU23 Exchange Server 2016 CU23 ESU only Security update
    KB5074995

    Mail-server spoofing vulnerability addressed; ESU coverage ends in October

    Addresses an Important spoofing vulnerability in Exchange Server 2016. It is available only to organizations enrolled in the Extended Security Update program, which provides security updates through October 31, 2026.

    Build 15.1.2507.66
    Security 1 CVE
    Replaced by KB5094144 →
  • SharePoint Server · SE
    SharePoint Server SE SharePoint Server SE Security update
    KB5002833

    Word and Outlook spoofing flaws patched; farm issues fixed

    The update fixes two Important spoofing vulnerabilities affecting Word and Outlook, adds the Version 25H2 feature update, and addresses SharePoint farm, workflow, and document-handling problems.

    Build 16.0.19127.20518
    Security 2 CVEs
    Replaced by KB5002843 →
  • SharePoint Server · 2019
    SharePoint Server 2019 SharePoint Server 2019 Security update
    KB5002834

    Word and Outlook spoofing flaws fixed; web-process stalls addressed

    The update fixes two Important Word and Outlook spoofing flaws—tricks that make content appear to come from a trusted source—and addresses repeated SharePoint web-process stalls.

    Build 16.0.10417.20097
    Security 2 CVEs
    Replaced by KB5002845 →
  • SharePoint Server · 2016
    SharePoint Server 2016 SharePoint Server 2016 Security update
    KB5002841

    Word and Outlook spoofing flaws fixed; machine-key setting restored

    The update fixes two Important spoofing vulnerabilities affecting Word and Outlook, and restores the ability to set SharePoint machine keys after the September 2025 cumulative update.

    Build 16.0.5539.1002
    Security 2 CVEs
    Replaced by KB5002850 →
  • Office Online Server OOS Office Online Server Security update
    KB5002835

    Excel data disclosure and privilege vulnerabilities addressed

    The update resolves three Important vulnerabilities affecting Excel, including information disclosure and elevation of privilege. Office Online Server updates end on December 31, 2026.

    Build 16.0.10417.20097
    Security 3 CVEs
    Replaced by KB5002846 →
  • .NET Framework · 3.5, 4.8.1
    .NET Framework 3.5 / 4.8.1 .NET Framework 3.5 / 4.8.1 for Windows 11 26H1 Security update
    KB5074837

    .NET information disclosure flaw and runtime issues addressed

    The update addresses CVE-2025-55248, an information disclosure vulnerability, and three .NET Runtime reliability issues, including a possible crash on Arm64.

    Build 4.8.9325.0
    Security 1 CVE
    Replaced by KB5082421 →
  • Windows 11 · 26H2
    Windows 11 Windows 11 Insider 26H2 Insider Preview
    Experimental Channel
    Build 26300.7760

    New emoji and camera pan and tilt controls

    Adds Emoji 16.0 and pan and tilt controls for supported cameras, with gradual rollouts for Insiders.

    Package KB5077202
    Changes 2 new · 3 improved
  • Windows 11 · 25H2
    Windows 11 Windows 11 Insider 25H2 Insider Preview
    Beta Channel
    Build 26220.7755

    Emoji 16.0 and camera controls arrive in Beta

    Beta Channel build 26220.7755 gradually adds seven Emoji 16.0 designs and pan-and-tilt controls for supported cameras, and improves taskbar, desktop-icon, and Windows Security credential pop-up scenarios.

    Package KB5077201
    Changes 2 new · 3 improved
  • Windows 11 · 26H1
    Windows 11 Windows 11 Insider 26H1 Insider Preview
    Experimental Channel
    Build 28020.1546

    OneDrive and Dropbox file handling gets a fix

    Includes general improvements and fixes an issue with apps working with files on OneDrive or Dropbox.

    Changes 1 fix
  • Windows 11 · 26H2
    Windows 11 Windows 11 Insider 26H2 Insider Preview
    Experimental Channel
    Build 26300.7733

    Built-in Sysmon and Netherlands Voice Access support

    Adds built-in Sysmon and Voice Access support for the Netherlands locale, and fixes File Explorer issues and hangs involving cloud files.

    Package KB5074178
    Changes 2 new · 2 fixes
  • Windows 11 · 25H2
    Windows 11 Windows 11 Insider 25H2 Insider Preview
    Beta Channel
    Build 26220.7752

    Built-in Sysmon, Dutch Voice Access, and file-handling fixes

    Beta Channel Insiders are testing built-in Sysmon, Netherlands locale support in Voice Access, and fixes for File Explorer and apps handling cloud files.

    Package KB5074177
    Changes 2 new · 2 fixes