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Windows Server 2025 Windows Server 2025 Out-of-band update
Out-of-band

KB5070773

KB5070773: Cumulative update for Windows Server, version 2025, October 2025. USB keyboards and mice work again in WinRE

In short

USB keyboards and mice work again in WinRE after the October 14 security update stopped them from working there. They continued to work normally in Windows.

Does it affect you? Applies to: Devices running Windows Server 2025, build 26100. This update is available for x64.

Build
26100.6901
Restart
Required

Microsoft publishes separate notes for this KB for Windows 11.

What changes

Fix 1 change

USB

  • USB keyboards and mice work again in Windows Recovery Environment. They continued to work normally in Windows.1
    Fixes the issue that prevented USB devices from working in the Windows Recovery Environment (WinRE) after KB5066835.

Improvement 1 change

Servicing stack

  • The component that installs Windows updates gets quality improvements to help devices receive and install updates reliably.2
    Includes servicing stack update KB5067360, build 26100.6893.

Known issues

  1. Open Affects: Organizations and IT administrators

    Active Directory Replication

    Duplicate entries in Active Directory schema attributes can cause replication to fail with a schema mismatch. The page lists this issue for this update and points to KB5068861 as addressing it.3

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

  2. Open Affects: Organizations and IT administrators

    Directory synchronization (DirSync)

    DirSync applications can incompletely sync large on-premises Active Directory security groups with more than 10,000 members. The page lists this issue for this update and points to KB5068861 as addressing it.4

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

  3. Open Affects: Organizations and IT administrators

    IIS websites might fail to load

    The listed IIS website connection issue does not affect Windows Server 2025. No action is needed for Windows Server 2025.5

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2025-10-20
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5066835, KB5068221, KB5065426, KB5063878
+12 earlier KB5064489, KB5062553, KB5060842, KB5058411, KB5055523, KB5053598, KB5051987, KB5050009, KB5048667, KB5046617, KB5043080, KB5044284
Replaced by
KB5070881
VersionBuildChannel
2025 26100.6901 General availability

Security

No vulnerabilities are listed for this update.

Updated components

263 files changed since the previous update for the same versions.

Top changed componentsFiles
Graphics and display3
Kernel3
File Explorer and shell2
Hyper-V and virtualization2
Secure Boot2
Settings2
Windows Update2
Printing1

Sources

Updated
Cited passages from Microsoft's official notes (5)
  1. 1. [USB] Fixed: After installing the Windows security update released on October 14, 2025 (KB5066835), USB devices, such as keyboards and mice, do not function in the Windows Recovery Environment (WinRE). support.microsoft.com
  2. 2. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  3. 3. This issue is addressed KB5068861. support.microsoft.com
  4. 4. This issue is addressed in KB5068861. support.microsoft.com
  5. 5. Windows Server 2025 users aren’t affected, and no action is required. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 5 quoted passages · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 3/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake