Microsoft January 2026 Security Updates

January 2026 Security Updates

This release consists of the following 112 Microsoft CVEs:

Tag CVE Base Score CVSS Vector Exploitability FAQs? Workarounds? Mitigations?
Windows Deployment Services CVE-2026-0386
SQL Server CVE-2026-20803
Windows Hello CVE-2026-20804 7.7
Desktop Window Manager CVE-2026-20805
Printer Association Object CVE-2026-20808
Windows Kernel Memory CVE-2026-20809
Windows Ancillary Function Driver for WinSock CVE-2026-20810
Windows Win32K - ICOMP CVE-2026-20811
Windows LDAP - Lightweight Directory Access Protocol CVE-2026-20812
Graphics Kernel CVE-2026-20814
Capability Access Management Service (camsvc) CVE-2026-20815
Windows Installer CVE-2026-20816
Windows Error Reporting CVE-2026-20817
Windows Kernel CVE-2026-20818
Windows Virtualization-Based Security (VBS) Enclave CVE-2026-20819
Windows Common Log File System Driver CVE-2026-20820
Windows Remote Procedure Call CVE-2026-20821
Microsoft Graphics Component CVE-2026-20822
Windows File Explorer CVE-2026-20823
Windows Remote Assistance CVE-2026-20824
Windows Hyper-V CVE-2026-20825
Tablet Windows User Interface (TWINUI) Subsystem CVE-2026-20826
Tablet Windows User Interface (TWINUI) Subsystem CVE-2026-20827
Windows Internet Connection Sharing (ICS) CVE-2026-20828
Windows TPM CVE-2026-20829
Capability Access Management Service (camsvc) CVE-2026-20830
Windows Ancillary Function Driver for WinSock CVE-2026-20831
Windows Remote Procedure Call Interface Definition Language (IDL) CVE-2026-20832
Windows Kerberos CVE-2026-20833
Windows Shell CVE-2026-20834
Capability Access Management Service (camsvc) CVE-2026-20835
Graphics Kernel CVE-2026-20836
Windows Media CVE-2026-20837
Windows Kernel CVE-2026-20838 5.5
Windows Client-Side Caching (CSC) Service CVE-2026-20839
Windows NTFS CVE-2026-20840
Windows DWM CVE-2026-20842
Windows Routing and Remote Access Service (RRAS) CVE-2026-20843
Windows Clipboard Server CVE-2026-20844
Windows Shell CVE-2026-20847
Windows SMB Server CVE-2026-20848
Windows Kerberos CVE-2026-20849
Capability Access Management Service (camsvc) CVE-2026-20851
Windows Hello CVE-2026-20852
Windows WalletService CVE-2026-20853
Windows Local Security Authority Subsystem Service (LSASS) CVE-2026-20854
Windows Server Update Service CVE-2026-20856
Windows Cloud Files Mini Filter Driver CVE-2026-20857
Windows Management Services CVE-2026-20858
Windows Kernel-Mode Drivers CVE-2026-20859
Windows Ancillary Function Driver for WinSock CVE-2026-20860
Windows Management Services CVE-2026-20861
Windows Management Services CVE-2026-20862
Windows Win32K - ICOMP CVE-2026-20863
Connected Devices Platform Service (Cdpsvc) CVE-2026-20864
Windows Management Services CVE-2026-20865
Windows Management Services CVE-2026-20866
Windows Management Services CVE-2026-20867
Windows Routing and Remote Access Service (RRAS) CVE-2026-20868
Windows Local Session Manager (LSM) CVE-2026-20869
Windows Win32K - ICOMP CVE-2026-20870
Desktop Window Manager CVE-2026-20871
Windows NTLM CVE-2026-20872


Windows Management Services CVE-2026-20873
Windows Management Services CVE-2026-20874
Windows Local Security Authority Subsystem Service (LSASS) CVE-2026-20875
Windows Virtualization-Based Security (VBS) Enclave CVE-2026-20876
Windows Management Services CVE-2026-20877
Windows Management Services CVE-2026-20918
Windows SMB Server CVE-2026-20919
Windows Win32K - ICOMP CVE-2026-20920
Windows SMB Server CVE-2026-20921
Windows NTFS CVE-2026-20922
Windows Management Services CVE-2026-20923
Windows Management Services CVE-2026-20924
Windows NTLM CVE-2026-20925
Windows SMB Server CVE-2026-20926
Windows SMB Server CVE-2026-20927
Windows HTTP.sys CVE-2026-20929
Windows Telephony Service CVE-2026-20931
Windows File Explorer CVE-2026-20932
Windows SMB Server CVE-2026-20934
Windows Virtualization-Based Security (VBS) Enclave CVE-2026-20935
Windows NDIS CVE-2026-20936
Windows File Explorer CVE-2026-20937
Windows Virtualization-Based Security (VBS) Enclave CVE-2026-20938
Windows File Explorer CVE-2026-20939
Windows Cloud Files Mini Filter Driver CVE-2026-20940
Host Process for Windows Tasks CVE-2026-20941
Microsoft Office CVE-2026-20943
Microsoft Office Word CVE-2026-20944
Microsoft Office Excel CVE-2026-20946
Microsoft Office SharePoint CVE-2026-20947
Microsoft Office Word CVE-2026-20948
Microsoft Office Excel CVE-2026-20949
Microsoft Office Excel CVE-2026-20950
Microsoft Office SharePoint CVE-2026-20951
Microsoft Office CVE-2026-20952
Microsoft Office CVE-2026-20953
Microsoft Office Excel CVE-2026-20955
Microsoft Office Excel CVE-2026-20956
Microsoft Office Excel CVE-2026-20957
Microsoft Office SharePoint CVE-2026-20958
Microsoft Office SharePoint CVE-2026-20959
Dynamic Root of Trust for Measurement (DRTM) CVE-2026-20962
Microsoft Office SharePoint CVE-2026-20963
Windows Admin Center CVE-2026-20965
Inbox COM Objects CVE-2026-21219
Capability Access Management Service (camsvc) CVE-2026-21221
Azure Connected Machine Agent CVE-2026-21224
Azure Core shared client library for Python CVE-2026-21226
Windows Secure Boot CVE-2026-21265

We are republishing 3 non-Microsoft CVEs:
CNA Tag CVE FAQs? Workarounds? Mitigations?
MITRE Corporation Agere Windows Modem Driver CVE-2023-31096
MITRE Corporation Windows Motorola Soft Modem Driver CVE-2024-55414
Chrome Microsoft Edge (Chromium-based) CVE-2026-0628

Security Update Guide Blog Posts
Date Blog Post
October 31, 2025 You asked, we delivered: Introducing new features for an improved security experience
October 28, 2025 Understanding CVE-2025-55315: What CISOs, security engineers, and sysadmins should know
October 22, 2025 Toward greater transparency: Introducing machine-readable Vulnerability Exploitability Xchange (VEX) for Azure Linux and beyond
November 12, 2024 Toward greater transparency: Publishing machine-readable CSAF files
June 27, 2024 Toward greater transparency: Unveiling Cloud Service CVEs
April 9, 2024 Toward greater transparency: Security Update Guide now shares CWEs for CVEs
January 6, 2023 Publishing CBL-Mariner CVEs on the Security Update Guide CVRF API
January 11, 2022 Coming Soon: New Security Update Guide Notification System
February 9, 2021 Continuing to Listen: Good News about the Security Update Guide API
January 13, 2021 Security Update Guide Supports CVEs Assigned by Industry Partners
December 8, 2020 Security Update Guide: Let’s keep the conversation going
November 9, 2020 Vulnerability Descriptions in the New Version of the Security Update Guide

Relevant Resources

• The new Hotpatching feature is now generally available. Please see Hotpatching feature for Windows Server Azure Edition virtual machines (VMs) for more information.
• Windows 10 and Windows 11 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10 and Windows 11, in addition to non-security updates. The updates are available via the Microsoft Update Catalog. For information on lifecycle and support dates for Windows 10 and Windows 11 operating systems, please see Windows Lifecycle Facts Sheet.
• Microsoft is improving Windows Release Notes. For more information, please see What's next for Windows release notes.
• 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.
• In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.
• Customers running Windows Server 2008 R2, or Windows Server 2008 need to purchase the Extended Security Update to continue receiving security updates. See 4522133 for more information.

Known Issues
You can see these in more detail from the Deployments tab by selecting Known Issues column in the Edit Columns panel.

For more information about Windows Known Issues, please see Windows message center (links to currently-supported versions of Windows are in the left pane).

KB Article Applies To
5073379 Windows Server 2025
5073450 Windows Server 23H2
5073457 Windows Server 2022
5074109 Windows 11, version 24H2, Windows 11, version 25H2
Released: Jan 13, 2026

January 2026 Security Updates - Release Notes - Security Update Guide - Microsoft