January 2026 Microsoft Patch Tuesday Summary


Azure Connected Machine Agent Elevation of Privilege Vulnerability


CVE-2026-21224

No

No

Important

7.8

6.8


Azure Core shared client library for Python Remote Code Execution Vulnerability


CVE-2026-21226

No

No

Important

7.5

6.5


Capability Access Management Service (camsvc) Elevation of Privilege Vulnerability


CVE-2026-20815

No

No

Important

7.0

6.1


CVE-2026-20830

No

No

Important

7.0

6.1


CVE-2026-21221

No

No

Important

7.0

6.1


Capability Access Management Service (camsvc) Information Disclosure Vulnerability


CVE-2026-20835

No

No

Important

5.5

4.8


CVE-2026-20851

No

No

Important

6.2

5.4


Chromium: CVE-2026-0628 Insufficient policy enforcement in WebView tag


CVE-2026-0628

No

No

 

 


Desktop Window Manager Information Disclosure Vulnerability


CVE-2026-20805

No

Yes

Important

5.5

4.8


Desktop Windows Manager Elevation of Privilege Vulnerability


CVE-2026-20871

No

No

Important

7.8

6.8


DirectX Graphics Kernel Elevation of Privilege Vulnerability


CVE-2026-20814

No

No

Important

7.0

6.1


CVE-2026-20836

No

No

Important

7.0

6.1


Dynamic Root of Trust for Measurement (DRTM) Information Disclosure Vulnerability


CVE-2026-20962

No

No

Important

4.4

3.9


Host Process for Windows Tasks Elevation of Privilege Vulnerability


CVE-2026-20941

No

No

Important

7.8

6.8


Inbox COM Objects (Global Memory) Remote Code Execution Vulnerability


CVE-2026-21219

No

No

Important

7.0

6.1


LDAPTampering Vulnerability


CVE-2026-20812

No

No

Important

6.5

5.7


Microsoft DWM Core Library Elevation of Privilege Vulnerability


CVE-2026-20842

No

No

Important

7.0

6.1


Microsoft Excel Remote Code Execution Vulnerability


CVE-2026-20946

No

No

Important

7.8

6.8


CVE-2026-20955

No

No

Critical

7.8

6.8


CVE-2026-20956

No

No

Important

7.8

6.8


CVE-2026-20950

No

No

Important

7.8

6.8


CVE-2026-20957

No

No

Critical

7.8

6.8


Microsoft Excel Security Feature Bypass Vulnerability


CVE-2026-20949

No

No

Important

7.8

6.8


Microsoft Office Click-To-Run Elevation of Privilege Vulnerability


CVE-2026-20943

No

No

Important

7.0

6.1


Microsoft Office Remote Code Execution Vulnerability


CVE-2026-20953

No

No

Critical

8.4

7.3


CVE-2026-20952

No

No

Critical

8.4

7.3


Microsoft SQL Server Elevation of Privilege Vulnerability


CVE-2026-20803

No

No

Important

7.2

6.3


Microsoft SharePoint Information Disclosure Vulnerability


CVE-2026-20958

No

No

Important

5.4

4.7


Microsoft SharePoint Remote Code Execution Vulnerability


CVE-2026-20963

No

No

Important

8.8

7.7


Microsoft SharePoint Server Remote Code Execution Vulnerability


CVE-2026-20951

No

No

Important

7.8

6.8


CVE-2026-20947

No

No

Important

8.8

7.7


Microsoft SharePoint Server Spoofing Vulnerability


CVE-2026-20959

No

No

Important

4.6

4.0


Microsoft Windows File Explorer Spoofing Vulnerability


CVE-2026-20847

No

No

Important

6.5

5.7


Microsoft Word Remote Code Execution Vulnerability


CVE-2026-20944

No

No

Critical

8.4

7.3


CVE-2026-20948

No

No

Important

7.8

6.8


NTLM Hash Disclosure Spoofing Vulnerability


CVE-2026-20925

No

No

Important

6.5

5.7


CVE-2026-20872

No

No

Important

6.5

5.7


Remote Procedure Call Information Disclosure Vulnerability


CVE-2026-20821

No

No

Important

6.2

5.4


Secure Boot Certificate Expiration Security Feature Bypass Vulnerability


CVE-2026-21265

Yes

No

Important

6.4

5.6


TPM Trustlet Information Disclosure Vulnerability


CVE-2026-20829

No

No

Important

5.5

4.8


Tablet Windows User Interface (TWINUI) Subsystem Information Disclosure Vulnerability


CVE-2026-20826

No

No

Important

7.8

6.8


CVE-2026-20827

No

No

Important

5.5

4.8


Win32k Elevation of Privilege Vulnerability


CVE-2026-20811

No

No

Important

7.8

6.8


CVE-2026-20920

No

No

Important

7.8

6.8


CVE-2026-20863

No

No

Important

7.0

6.1


Windows Admin Center Elevation of Privilege Vulnerability


CVE-2026-20965

No

No

Important

7.5

6.5


Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability


CVE-2026-20810

No

No

Important

7.8

6.8


CVE-2026-20831

No

No

Important

7.8

6.8


CVE-2026-20860

No

No

Important

7.8

6.8


Windows Client-Side Caching (CSC) Service Information Disclosure Vulnerability


CVE-2026-20839

No

No

Important

5.5

4.8


Windows Clipboard Server Elevation of Privilege Vulnerability


CVE-2026-20844

No

No

Important

7.4

6.4


Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability


CVE-2026-20857

No

No

Important

7.8

6.8


CVE-2026-20940

No

No

Important

7.8

6.8


Windows Common Log File System Driver Elevation of Privilege Vulnerability


CVE-2026-20820

No

No

Important

7.8

6.8


Windows Connected Devices Platform Service Elevation of Privilege Vulnerability


CVE-2026-20864

No

No

Important

7.8

6.8


Windows Deployment Services Remote Code Execution Vulnerability


CVE-2026-0386

No

No

Important

7.5

6.5


Windows Error Reporting Service Elevation of Privilege Vulnerability


CVE-2026-20817

No

No

Important

7.8

6.8


Windows File Explorer Elevation of Privilege Vulnerability


CVE-2026-20808

No

No

Important

7.0

6.1


Windows File Explorer Information Disclosure Vulnerability


CVE-2026-20823

No

No

Important

5.5

4.8


CVE-2026-20932

No

No

Important

5.5

4.8


CVE-2026-20937

No

No

Important

5.5

4.8


CVE-2026-20939

No

No

Important

5.5

4.8


Windows Graphics Component Elevation of Privilege Vulnerability


CVE-2026-20822

No

No

Critical

7.8

6.8


Windows HTTP.sys Elevation of Privilege Vulnerability


CVE-2026-20929

No

No

Important

7.5

6.5


Windows Hello Tampering Vulnerability


CVE-2026-20804

No

No

Important

7.7

6.7


CVE-2026-20852

No

No

Important

7.7

6.7


Windows Hyper-V Information Disclosure Vulnerability


CVE-2026-20825

No

No

Important

4.4

3.9


Windows Installer Elevation of Privilege Vulnerability


CVE-2026-20816

No

No

Important

7.8

6.8


Windows Kerberos Elevation of Privilege Vulnerability


CVE-2026-20849

No

No

Important

7.5

6.5


Windows Kerberos Information Disclosure Vulnerability


CVE-2026-20833

No

No

Important

5.5

4.8


Windows Kernel Information Disclosure Vulnerability


CVE-2026-20818

No

No

Important

6.2

5.4


CVE-2026-20838

No

No

Important

5.5

4.8


Windows Kernel Memory Elevation of Privilege Vulnerability


CVE-2026-20809

No

No

Important

7.8

6.8


Windows Kernel-Mode Driver Elevation of Privilege Vulnerability


CVE-2026-20859

No

No

Important

7.8

6.8


Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability


CVE-2026-20875

No

No

Important

7.5

6.5


Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability


CVE-2026-20854

No

No

Critical

7.5

6.5


Windows Local Session Manager (LSM) Elevation of Privilege Vulnerability


CVE-2026-20869

No

No

Important

7.0

6.1


Windows Management Services Elevation of Privilege Vulnerability


CVE-2026-20858

No

No

Important

7.8

6.9


CVE-2026-20865

No

No

Important

7.8

6.8


CVE-2026-20877

No

No

Important

7.8

6.8


CVE-2026-20918

No

No

Important

7.8

6.8


CVE-2026-20923

No

No

Important

7.8

6.8


CVE-2026-20924

No

No

Important

7.8

6.8


CVE-2026-20861

No

No

Important

7.8

6.8


CVE-2026-20866

No

No

Important

7.8

6.8


CVE-2026-20867

No

No

Important

7.8

6.8


CVE-2026-20873

No

No

Important

7.8

6.8


CVE-2026-20874

No

No

Important

7.8

6.8


Windows Management Services Information Disclosure Vulnerability


CVE-2026-20862

No

No

Important

5.5

4.8


Windows Media Remote Code Execution Vulnerability


CVE-2026-20837

No

No

Important

7.8

6.8


Windows NDIS Information Disclosure Vulnerability


CVE-2026-20936

No

No

Important

4.3

3.8


Windows NTFS Remote Code Execution Vulnerability


CVE-2026-20840

No

No

Important

7.8

6.8


CVE-2026-20922

No

No

Important

7.8

6.8


Windows Remote Assistance Security Feature Bypass Vulnerability


CVE-2026-20824

No

No

Important

5.5

4.8


Windows Remote Procedure Call Interface Definition Language (IDL) Elevation of Privilege Vulnerability


CVE-2026-20832

No

No

Important

7.8

6.8


Windows Routing and Remote Access Service (RRAS) Elevation of Privilege Vulnerability


CVE-2026-20843

No

No

Important

7.8

6.8


Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability


CVE-2026-20868

No

No

Important

8.8

7.7


Windows SMB Server Denial of Service Vulnerability


CVE-2026-20927

No

No

Important

5.3

4.6


Windows SMB Server Elevation of Privilege Vulnerability


CVE-2026-20919

No

No

Important

7.5

6.5


CVE-2026-20921

No

No

Important

7.5

6.5


CVE-2026-20926

No

No

Important

7.5

6.5


CVE-2026-20934

No

No

Important

7.5

6.5


CVE-2026-20848

No

No

Important

7.5

6.5


Windows Server Update Service (WSUS) Remote Code Execution Vulnerability


CVE-2026-20856

No

No

Important

8.1

7.1


Windows Spoofing Vulnerability


CVE-2026-20834

No

No

Important

4.6

4.0


Windows Telephony Service Elevation of Privilege Vulnerability


CVE-2026-20931

No

No

Important

8.0

7.0


Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability


CVE-2026-20876

No

No

Critical

6.7

5.8


CVE-2026-20938

No

No

Important

7.8

6.8


Windows Virtualization-Based Security (VBS) Information Disclosure Vulnerability


CVE-2026-20819

No

No

Important

5.5

4.8


CVE-2026-20935

No

No

Important

6.2

5.4


Windows WalletService Elevation of Privilege Vulnerability


CVE-2026-20853

No

No

Important

7.4

6.4


Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability


CVE-2026-20870

No

No

Important

7.8

6.8


Windows rndismp6.sys Information Disclosure Vulnerability


CVE-2026-20828

No

No

Important

4.6

4.0




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