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The Update Bureau
Security

KB5078885: all 43 vulnerabilities

Cumulative update for Windows 10, versions 21H2 and 22H2, March 2026. The update page explains it and lists only the exploited, publicly disclosed and critical vulnerabilities; here are all of them, most severe first.

Vulnerabilities fixed

43 vulnerabilities fixed
43 important
VulnerabilitySeverityCVSS
RPC Runtime Library Remote Code Execution Vulnerability
Important 8.8
Active Directory Domain Services Elevation of Privilege Vulnerability
Important 8.8
Windows Telephony Service Elevation of Privilege Vulnerability
Important 8.8
Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
Important 8.0
Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
Important 8.0
Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
Important 8.0
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
Important 7.8
Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability
Important 7.8
Windows Kernel Elevation of Privilege Vulnerability
Important 7.8
Windows Kernel Elevation of Privilege Vulnerability
Important 7.8
Windows Projected File System Elevation of Privilege Vulnerability
Important 7.8
Windows Accessibility Infrastructure (ATBroker.exe) Elevation of Privilege Vulnerability
Important 7.8
Windows Connected Devices Platform Service Elevation of Privilege Vulnerability
Important 7.8
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Important 7.8
Windows SMB Server Elevation of Privilege Vulnerability
Important 7.8
Performance Counters for Windows Elevation of Privilege Vulnerability
Important 7.8
Windows Extensible File Allocation Table Elevation of Privilege Vulnerability
Important 7.8
Windows NTFS Elevation of Privilege Vulnerability
Important 7.8
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Important 7.8
Winlogon Elevation of Privilege Vulnerability
Important 7.8
Windows DWM Core Library Elevation of Privilege Vulnerability
Important 7.8
Windows GDI Remote Code Execution Vulnerability
Important 7.8
Windows SMB Server Elevation of Privilege Vulnerability
Important 7.8
Windows Kernel Elevation of Privilege Vulnerability
Important 7.8
MapUrlToZone Security Feature Bypass Vulnerability
Important 7.5
GDI+ Information Disclosure Vulnerability
Important 7.5
Broadcast DVR Elevation of Privilege Vulnerability
Important 7.0
Windows Graphics Component Elevation of Privilege Vulnerability
Important 7.0
Windows Bluetooth RFCOM Protocol Driver Elevation of Privilege Vulnerability
Important 7.0
Win32k Elevation of Privilege Vulnerability
Important 7.0
Windows Device Association Service Elevation of Privilege Vulnerability
Important 7.0
Windows Device Association Service Elevation of Privilege Vulnerability
Important 7.0
Windows Authentication Elevation of Privilege Vulnerability
Important 7.0
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Important 7.0
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Important 7.0
Windows Mobile Broadband Driver Remote Code Execution Vulnerability
Important 6.8
Windows Kerberos Security Feature Bypass Vulnerability
Important 6.5
Windows Graphics Component Denial of Service Vulnerability
Important 6.2
Windows Graphics Component Denial of Service Vulnerability
Important 6.2
Push message Routing Service Elevation of Privilege Vulnerability
Important 5.5
Windows Graphics Component Information Disclosure Vulnerability
Important 5.5
Windows Accessibility Infrastructure (ATBroker.exe) Information Disclosure Vulnerability
Important 5.5
Windows Shell Link Processing Spoofing Vulnerability
Important 5.3