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The Update Bureau
Security

KB5087538: all 55 vulnerabilities

Cumulative update for Windows Server, version 2019, May 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

55 vulnerabilities fixed
4 critical 51 important
VulnerabilitySeverityCVSS
Windows Netlogon Remote Code Execution Vulnerability
Critical 9.8
Windows Graphics Component Remote Code Execution Vulnerability
Critical 8.8
Windows GDI Remote Code Execution Vulnerability
Critical 7.8
Windows Native WiFi Miniport Driver Remote Code Execution Vulnerability
Critical 7.5
Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability
Important 8.8
Windows TCP/IP Remote Code Execution Vulnerability
Important 8.1
Windows Event Logging Service Elevation of Privilege Vulnerability
Important 7.8
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Important 7.8
Windows TCP/IP Local Elevation of Privilege Vulnerability
Important 7.8
Windows Message Queuing (MSMQ) Elevation of Privilege Vulnerability
Important 7.8
Win32k Elevation of Privilege Vulnerability
Important 7.8
Windows Win32k Elevation of Privilege Vulnerability
Important 7.8
Windows TCP/IP Elevation of Privilege Vulnerability
Important 7.8
Windows DWM Core Library Elevation of Privilege Vulnerability
Important 7.8
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Important 7.8
Windows Telephony Service Elevation of Privilege Vulnerability
Important 7.8
Windows Application Identity (AppID) Subsystem Elevation of Privilege Vulnerability
Important 7.8
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Important 7.8
Windows TCP/IP Elevation of Privilege Vulnerability
Important 7.8
Windows Storage Spaces Controller Elevation of Privilege Vulnerability
Important 7.8
Windows Win32k Elevation of Privilege Vulnerability
Important 7.8
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Important 7.8
Windows Kernel Elevation of Privilege Vulnerability
Important 7.8
Microsoft Cryptographic Services Elevation of Privilege Vulnerability
Important 7.8
Windows Telephony Service Elevation of Privilege Vulnerability
Important 7.8
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Important 7.8
Windows Remote Desktop Services Elevation of Privilege Vulnerability
Important 7.8
Windows TCP/IP Elevation of Privilege Vulnerability
Important 7.8
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Important 7.8
Windows WAN ARP Driver Elevation of Privilege Vulnerability
Important 7.8
Data Deduplication Elevation of Privilege Vulnerability
Important 7.8
Internet Key Exchange (IKE) Protocol Denial of Service Vulnerability
Important 7.5
Windows TCP/IP Information Disclosure Vulnerability
Important 7.5
Windows TCP/IP Denial of Service Vulnerability
Important 7.4
Windows TCP/IP Denial of Service Vulnerability
Important 7.4
Windows TCP/IP Denial of Service Vulnerability
Important 7.1
Win32k Elevation of Privilege Vulnerability
Important 7.0
Win32k Elevation of Privilege Vulnerability
Important 7.0
Windows Projected File System Elevation of Privilege Vulnerability
Important 7.0
Windows Link-Layer Discovery Protocol (LLDP) Elevation of Privilege Vulnerability
Important 7.0
Windows Print Spooler Elevation of Privilege Vulnerability
Important 7.0
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Important 7.0
Windows Win32k Elevation of Privilege Vulnerability
Important 7.0
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Important 7.0
Windows SMB Client Elevation of Privilege Vulnerability
Important 7.0
Windows Telephony Service Elevation of Privilege Vulnerability
Important 7.0
Windows Rich Text Edit Elevation of Privilege Vulnerability
Important 6.7
Windows Rich Text Edit Elevation of Privilege Vulnerability
Important 6.7
Secure Boot Security Feature Bypass Vulnerability
Important 6.7
Windows TCP/IP Driver Security Feature Bypass Vulnerability
Important 6.5
Windows Volume Manager Extension Driver Remote Code Execution Vulnerability
Important 6.2
Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability
Important 5.5
Windows 11 Telnet Client Information Disclosure Vulnerability
Important 5.4
Windows Filtering Platform (WFP) Security Feature Bypass Vulnerability
Important 4.4
AMD: CVE-2025-54518 CPU OP Cache Corruption
Important —