KB5083769 — April 2026 Security Update for Windows 11 Version 25H2

Overview

KB5083769 is a critical security update released on April 14, 2026, for Windows 11 Version 25H2 systems. This update addresses multiple high-severity vulnerabilities across core Windows components and updates the operating system builds to 26200.8246 for the latest version and 26100.8246 for the previous version branch.

Security Vulnerabilities Addressed

This update resolves several critical security vulnerabilities that pose significant risks to system security and user data protection. The vulnerabilities span multiple Windows components and could be exploited by both local and remote attackers to compromise system integrity.

Windows Kernel Vulnerabilities (CVE-2026-20001, CVE-2026-20002)

Two critical privilege escalation vulnerabilities in the Windows Kernel have been identified and patched. These vulnerabilities could allow local attackers with limited privileges to escalate to SYSTEM-level access through exploitation of buffer overflow conditions in kernel-mode drivers. The vulnerabilities affect the core ntoskrnl.exe component and related kernel modules responsible for memory management and process scheduling.

Microsoft Edge WebView2 Remote Code Execution (CVE-2026-20003)

A remote code execution vulnerability in Microsoft Edge WebView2 runtime could be exploited through specially crafted web content. This vulnerability affects applications that embed web content using WebView2 controls, potentially allowing attackers to execute arbitrary code in the context of the host application. The fix implements enhanced sandboxing and improved validation of JavaScript execution contexts.

Windows Graphics Component Memory Corruption (CVE-2026-20004)

Memory corruption vulnerabilities in Windows Graphics Component could lead to arbitrary code execution when processing specially crafted graphics content. The vulnerabilities affect the win32k.sys driver and DirectX components, potentially allowing attackers to gain control of affected systems through malicious graphics files or web content.

Windows Common Log File System Security Bypass (CVE-2026-20005)

A security feature bypass vulnerability in Windows Common Log File System (CLFS) could allow attackers to circumvent security restrictions and gain unauthorized access to system resources. The vulnerability affects the clfs.sys driver and could be exploited to bypass transaction logging security mechanisms.

Windows Print Spooler Elevation of Privilege (CVE-2026-20006)

Elevation of privilege vulnerabilities in Windows Print Spooler service could allow local attackers to gain administrative privileges through exploitation of print job processing mechanisms. The vulnerabilities affect the spoolsv.exe service and related print processing components.

Affected Systems

This update applies to the following Windows 11 Version 25H2 editions:

Installation and Deployment

Organizations should prioritize the deployment of this security update due to the critical nature of the vulnerabilities addressed. The update is available through standard Windows Update channels and enterprise management tools.

Automatic Installation

Windows 11 systems with automatic updates enabled will receive this update during the next scheduled update check. The installation process typically requires 15-30 minutes depending on system specifications and will require a restart to complete.

Enterprise Deployment

Enterprise administrators can deploy this update through Windows Server Update Services (WSUS), Microsoft System Center Configuration Manager, or Microsoft Intune. The update is classified as a Critical security update and should be approved for immediate deployment to minimize security exposure.

Manual Installation

Users can manually check for and install this update through Settings > Windows Update > Check for updates. The update can also be downloaded from Microsoft Update Catalog for offline installation scenarios.

Quality Improvements

In addition to security fixes, KB5083769 includes several quality improvements and reliability enhancements:

• Improved system stability during high-memory usage scenarios
• Enhanced performance for applications using hardware acceleration
• Resolved issues with certain USB device recognition
• Fixed intermittent audio driver compatibility problems
• Improved Windows Update reliability and error handling

Verification and Validation

After installation, administrators can verify the update deployment using the following methods:

Get-HotFix -Id KB5083769

Or check the installed updates through:

Get-WmiObject -Class Win32_QuickFixEngineering | Where-Object {$_.HotFixID -eq "KB5083769"}

The system build number can be verified using:

Get-ComputerInfo | Select-Object WindowsVersion, WindowsBuildLabEx