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The Update Bureau

Monthly Patch Briefing

May 2026

63 updates released this month .

Updates, page 3

Updates, page 3:
  • .NET Framework · 3.5, 4.8
    .NET Framework 3.5 / 4.8 .NET Framework 3.5 / 4.8 for Windows 10 21H2, 22H2 Security update
    KB5087064

    Two runtime privilege flaws addressed

    The update addresses two .NET Framework flaws that could let an attacker gain higher access. It applies to Windows 10 versions 21H2 and 22H2.

    Builds 4.8.4802.0 2.0.50727.9181
    Security 2 CVEs
    Replaced by KB5101006 →
  • .NET Framework · 3.5, 4.8
    .NET Framework 3.5 / 4.8 .NET Framework 3.5 / 4.8 for Windows Server 2022 Security update
    KB5087068

    Two flaws could let users gain higher privileges

    The update addresses two .NET Framework security flaws that could let users gain higher privileges on Windows Server 2022.

    Builds 4.8.4802.0 2.0.50727.9181
    Security 2 CVEs
    Replaced by KB5101010 →
  • .NET Framework · 3.5, 4.8
    .NET Framework 3.5 / 4.8 .NET Framework 3.5 / 4.8 for Windows 10 1809 · Windows Server 2019 Security update
    KB5087066

    Two privilege-escalation vulnerabilities addressed

    Addresses two .NET Framework elevation-of-privilege vulnerabilities. It applies to Windows 10, version 1809 and Windows Server 2019 devices with .NET Framework 3.5 or 4.8 installed.

    Builds 4.8.4802.0 2.0.50727.9068
    Security 2 CVEs
    Replaced by KB5101008 →
  • .NET Framework · 4.8
    .NET Framework 4.8 .NET Framework 4.8 for Windows 10 1607 · Windows Server 2016 Security update
    KB5087065

    Two flaws that could give attackers more access are addressed

    Addresses two .NET Framework flaws that could let attackers gain more access.

    Build 4.8.4802.0
    Security 2 CVEs
    Replaced by KB5101007 →
  • .NET Framework · 3.5, 4.7.2
    .NET Framework 3.5 / 4.7.2 .NET Framework 3.5 / 4.7.2 for Windows 10 1809 · Windows Server 2019 Security update
    KB5087061

    Two flaws that could raise access are addressed

    The update addresses two flaws that could let attackers gain higher access. It adds no new reliability improvements.

    Builds 4.7.4142.0 2.0.50727.9068
    Security 2 CVEs
    Replaced by KB5100989 →
  • Windows 11 · Future platforms
    Windows 11 Windows 11 Insider Future platforms Insider Preview
    Experimental Channel
    Build 29580.1000

    Feedback Hub translations and larger feedback uploads

    Build 29580.1000 gradually updates Feedback Hub for Insiders in the Experimental Channel, with improved translations, reliability, and support for feedback files up to 500 MB.

    Changes 6 improved
  • Windows 11 · 26H1
    Windows 11 Windows 11 Insider 26H1 Insider Preview
    Experimental Channel
    Build 28020.2075

    ADLaM typing, clipboard history, and script rendering improvements

    Improves ADLaM typing reliability, clipboard history performance, and font rendering for several scripts.

    Changes 3 improved
  • Windows 11 · 26H2
    Windows 11 Windows 11 Insider 26H2 Insider Preview
    Experimental Channel
    Build 26300.8376

    More touchpad gestures and clearer File Explorer details

    Adds touchpad gesture controls and a K–12 upgrade path to Windows 11 Pro Education, alongside File Explorer changes and reliability fixes for Experimental Channel Insiders.

    Changes 5 new · 5 improved · 4 fixes
  • Windows 11 · 25H2
    Windows 11 Windows 11 Insider 25H2 Insider Preview
    Beta Channel
    Build 26220.8370

    Pro Education upgrade and fixes for notification and app issues

    Beta Channel Insiders get a no-cost upgrade path from Windows 11 Home to Pro Education for eligible K–12 environments, plus reliability improvements and a fix for notification and app launch issues.

    Changes 1 new · 2 improved · 1 fix
  • Exchange Server · RTM
    Exchange Server Subscription Edition RTM Exchange Server Subscription Edition RTM Hotfix update
    KB5081755

    Microsoft Graph adds hybrid free/busy and profile sharing

    Exchange Server SE RTM gains Microsoft Graph support for hybrid free/busy and profile picture sharing, plus partial MailTips support. The change replaces EWS in most hybrid scenarios ahead of its scheduled retirement from Exchange Online in October 2026.

    Build 15.2.2562.41
    Replaced by KB5094139 →
  • Windows 11 · 26H1
    Windows 11 Windows 11 Insider 26H1 Insider Preview
    Experimental Channel
    Build 28020.1921

    Task Manager adds NPU and app-isolation columns

    Build 28020.1921 gradually adds Task Manager columns for NPU use and app isolation, and updates Feedback Hub. Insiders in the Canary 28000 series are beginning to move to the Experimental (26H1) channel.

    Changes 3 new · 6 improved · 2 fixes
  • Windows 11 · 26H2
    Windows 11 Windows 11 Insider 26H2 Insider Preview
    Experimental Channel
    Build 26300.8346

    Quieter Widgets defaults and precise Magnifier zoom

    Build 26300.8346 for Dev Channel Insiders tests quieter Widgets defaults, a refreshed Run dialog, and more precise Magnifier zoom, alongside File Explorer and Feedback Hub changes.

    Changes 4 new · 8 improved · 5 fixes
  • Windows 11 · 25H2
    Windows 11 Windows 11 Insider 25H2 Insider Preview
    Beta Channel
    Build 26220.8340

    Share app suggestions reach AAD users; VM CPU speeds corrected

    Beta Channel Insiders get app suggestions in Windows Share, GB sizing for drives and volumes, saved Task Scheduler column widths, and a fix for CPU speed readings on virtual machines.

    Changes 1 new · 2 improved · 1 fix