Windows 10: The Last Windows Security Updates of January 2026 Are Here

Microsoft has released the first security updates of 2026 for its Windows operating system and other Microsoft products. The January Patch Tuesday addresses more than 110 security vulnerabilities across Windows, Microsoft Office, Edge, Azure components, and additional services.

The updates are available for all supported Windows versions. Windows 10 continues to receive security fixes only under Microsoft’s Extended Security Updates (ESU) program, while Windows 11 versions 24H2 and 25H2 are the primary consumer releases receiving updates.

Our monthly Patch Day overview provides home users and system administrators with a concise summary of released updates, vulnerability severity, known issues, and direct download resources.

Microsoft Security Updates — January 2026

Executive Summary:

• Microsoft released approximately 112–114 security updates in total
• Around 8 vulnerabilities are rated Critical
• At least one zero-day vulnerability is actively exploited, confirmed by Microsoft
• Security fixes cover Windows, Office, Edge, Azure, and server components

Windows clients with known issues

• Windows 11: versions 23H2, 24H2, 25H2

Windows Server products with known issues

• Windows Server 2023
• Windows Server 2025

Product Overview


Below is a breakdown of affected Windows versions and reported vulnerability counts.

Windows 11:


Windows 11 version 24H2

• Dozens of vulnerabilities fixed
• Includes remote code execution, privilege escalation, spoofing, and information disclosure flaws

Windows 11 version 25H2

• Same vulnerability scope as 24H2
• No critical vulnerabilities specific to this release alone

Windows 11 version 23H2 (Enterprise & Education)

• Still supported through enterprise servicing channels
• Receives cumulative security updates only

Windows 10


Windows 10 (Extended Security Updates only)

• Applies only to systems enrolled in ESU
• No feature updates
• General support ended in October 2025

Windows Server

• Windows Server 2016
• Windows Server 2019
• Windows Server 2022
• Windows Server 2023
• Windows Server 2025

All supported server versions received January security updates. No critical vulnerabilities were disclosed publicly for server products, but multiple important vulnerabilities were addressed.

Windows Security Updates

Windows 11 version 24H2 and 25H2


Support page: KB5074109

Updates and improvements:

• Security fixes for multiple remote code execution and elevation of privilege vulnerabilities
• Improvements to system stability and reliability
• Servicing changes related to Secure Boot and virtualization-based security

Windows 11 version 23H2 (Enterprise & Education)


Support page: KB5073455

Updates and improvements:

• Security fixes and quality improvements
• Includes changes related to Secure Boot certificates

Known issue:

• Systems with Secure Launch enabled may fail to shut down or enter sleep mode
• Devices may restart instead

Workaround:

Use a command prompt and run:

shutdown /s /t 0​

Microsoft has no workaround for sleep mode at this time.

Windows 10 (ESU)


Support page: KB5073724

• Security-only update
• Available exclusively to ESU-enrolled systems
• Removes outdated modem drivers as part of servicing

Windows Server Updates

• Windows Server 2025: KB5073379
• Windows Server 2023: KB5073450

Security updates only, no feature changes.

Servicing Stack and Quality Updates

• KB5077800 — Servicing Stack Update (released January 17, 2026)
  • Improves update installation reliability for older Windows builds

Microsoft Office Security Updates


Microsoft released Office and server component security updates on January 13, 2026.

Office updates include:

• Excel 2016 — KB5002831
• Office 2016 — KB5002826
• Word 2016 — KB5002829

SharePoint Server:

• SharePoint Server Subscription Edition — KB5002822
• SharePoint Server 2019 — KB5002825
• SharePoint Server 2016 — KB5002828

Language packs received corresponding updates.

Known Issues After Installing January Updates

Remote Desktop / Azure Virtual Desktop / Windows 365


After installing the January updates, some users report:

• Credential prompt failures
• Authentication issues in Azure Virtual Desktop and Windows 365
• Problems primarily affect the new Windows App

Workarounds:

• Use the classic Remote Desktop client
• Use the web-based RDP client

Microsoft has acknowledged the issue and is actively investigating.

Windows 11 23H2 Shutdown and Sleep Issues

• Affects devices with Secure Launch enabled
• Prevents normal shutdown and sleep behavior
• Documented in Windows Release Health

Microsoft has released out-of-band fixes for some affected systems as of January 18, 2026.

How to Install the January 2026 Updates Immediately


Security updates are rolled out automatically, but manual installation is possible.

1. Open the Start menu
2. Type Windows Update and open it
3. Select Check for updates
4. Choose Download & install all

Recommendation:

Create a full system backup before installing updates, especially on production systems.

Direct Update Downloads

Windows 11

• KB5074109 — Cumulative Update for Windows 11 24H2 / 25H2
• KB5073455 — Windows 11 23H2 (Enterprise & Education)

Windows 10 (ESU)

• KB5073724 — January 2026 ESU update

Additional Resources

• December 2025 Security Updates
• Microsoft Security Update Guide
• Windows 11 24H2 Update History
• Windows 11 25H2 Update History
• In-depth Windows Update installation guide

Thank you for being a Ghacks reader. The post The Last Windows Security Updates of January 2026 Are Here appeared first on gHacks Technology News.

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Windows 7 Ultimate (64) Security updates not installing.

I have been having problems in installing the updates that I have listed below. For each update I attempted to install them individually but they would not install. I also downloaded the SURT 6.1 KB947821 v27. The problem has been going on now for about 2 months. (whenever the issue with the updates comes to mind I am never near my pc). Thank you in advance.


Cumulative Security Update for Internet Explorer 9 for Windows 7 for x64-based Systems (KB2838727)
Security Update for Windows 7 for x64-based Systems (KB2757638)
Security Update for Windows 7 for x64-based Systems (KB2785220)
Security Update for Windows 7 for x64-based Systems (KB2790113)
Security Update for Windows 7 for x64-based Systems (KB2813170)
Security Update for Windows 7 for x64-based Systems (KB2813430)
Security Update for Windows 7 for x64-based Systems (KB2839894)
Update for Windows 7 for x64-based Systems (KB2726535)
Update for Windows 7 for x64-based Systems (KB2773072)
Update for Windows 7 for x64-based Systems (KB2786400)
Update for Windows 7 for x64-based Systems (KB2798162)
Update for Windows 7 for x64-based Systems (KB2808679)

 

Microsoft January 2020 Security Updates

Release Notes

January 2020 Security Updates

Release Date: January 14, 2020

The January security release consists of security updates for the following software:

• Microsoft Windows
• Internet Explorer
• Microsoft Office and Microsoft Office Services and Web Apps
• ASP.NET Core
• .NET Core
• .NET Framework
• OneDrive for Android
• Microsoft Dynamics

Please note the following information regarding the security updates:

• For information regarding enabling Windows 10, version 1909 features, please see
  
  Microsoft Update Catalog.
• For information on lifecycle and support dates for Windows 10 operating systems, please see
  
  Windows Lifecycle Facts Sheet.
• A list of the latest servicing stack updates for each operating system can be found in
  
  ADV990001. This list will be updated whenever a new servicing stack update is released. It is important to install the latest servicing stack update.
• Starting in May 2019, Internet Explorer 11 is available on Windows Server 2012. This configuration is present only in the IE Cumulative package.
• Updates for Windows RT 8.1 and Microsoft Office RT software are only available via
  
  Windows Update.
• In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.
• Note: Support for Windows 7, Windows Server 2008 R2, and Windows Server 2008 ends January 14, 2020. For more information please see
  
  Lifecycle FAQ-Extended Security Updates.

The following CVEs have FAQs with additional information and may include * further steps to take after installing the updates. Please note that this is not a complete list of CVEs for this release.

• CVE-2020-0601 *
• CVE-2020-0607
• CVE-2020-0608
• CVE-2020-0615
• CVE-2020-0622
• CVE-2020-0637
• CVE-2020-0639
• CVE-2020-0643
• CVE-2020-0647
• CVE-2020-0650
• CVE-2020-0651
• CVE-2020-0652
• CVE-2020-0653
• CVE-2020-0654 *

Known Issues

The f****ssues with the security updates. For a complete list of security update KBs, please see

2****ssues, please see Windows message center (links to currently-supported versions of Windows are in the left pane).

[table][tr][td]4534271[/td][td]Windows 10, version 1607, Windows Server 2016[/td][/tr][tr][td]4534273[/td][td]Windows 1****809[/td][/tr][tr][td]4534276[/td][td]Windows 10, version 1709[/td][/tr][tr][td]4534283[/td][td]Windows Server 2012 (Monthly Rollup)[/td][/tr][tr][td]4534288[/td][td]Windows Server 2012 (Security-only update)[/td][/tr][tr][td]4534293[/td][td]Windows 10, version 1803, Windows Server version 1803[/td][/tr][tr][td]4534297[/td][td]Windows 8.1, Windows Server 2012 R2 (Monthly Rollup)[/td][/tr][tr][td]4534306[/td][td]Windows 10[/td][/tr][tr][td]4534309[/td][td]Windows 8.1, Windows Server 2012 R2 (Security-only update[/td][/tr][/table]

 

Microsoft January 2019 Security Updates

Release Notes
January 2019 Security Updates

Release Date: January 08, 2019

The January security release consists of security updates for the following software:

• Adobe Flash Player
• Internet Explorer
• Microsoft Edge
• Microsoft Windows
• Microsoft Office and Microsoft Office Services and Web Apps
• ChakraCore
• .NET Framework
• ASP.NET
• Microsoft Exchange Server
• Microsoft Visual Studio

Please note the following information regarding the security updates:

• A list of the latest servicing stack updates for each operating system can be found in
  
  ADV990001. This list will be updated whenever a new servicing stack update is released. It is important to install the latest servicing stack update.
• Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the
  
  Microsoft Update Catalog.
• Updates for Windows RT 8.1 and Microsoft Office RT software are only available via
  
  Windows Update.
• For information on lifecycle and support dates for Windows 10 operating systems, please see
  
  Windows Lifecycle Facts Sheet.
• In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.

The following CVEs have FAQs with additional information and may include * further steps to take after installing the updates.

• ADV190001
• CVE-2019-0536
• CVE-2019-0537
• CVE-2019-0545
• CVE-2019-0549
• CVE-2019-0553
• CVE-2019-0554
• CVE-2019-0559
• CVE-2019-0560
• CVE-2019-0561
• CVE-2019-0569
• CVE-2019-0585
• CVE-2019-0588

Known Issues

• 4480961
• 4480973
• 4480978
• 4480966
• 4480970
• 4480116
• 4480962
• 4480963
• 4480975
• 4468742
• 4471389

Security Update Guide - Microsoft Security Response Center