Knowledgebase Catalog

September 2026

KB#Last UpdatedDescription
KB5120711Sep 11, 2026KB5120711 is a cumulative security and reliability update for .NET Framework 4.8.1 released on August 11, 2026, targeting Windows 11 version 26H1. This patch addresses multiple critical security vulnerabilities including elevation of privilege and remote code execution issues. The update…
KB5121647Sep 11, 2026KB5121647 is a cumulative security update for .NET Framework 3.5, 4.8, and 4.8.1 released on August 11, 2026, targeting Windows 10 Version 22H2. This patch addresses multiple critical security vulnerabilities affecting the .NET Framework runtime environment and is distributed through…
KB5126421Sep 11, 2026KB5126421 is a cumulative security and reliability update for .NET Framework 3.5 and 4.8.1 released on September 8, 2026. It applies to Windows 10 Version 21H2 and Windows 10 Version 22H2. This patch addresses critical vulnerabilities and includes general stability…
KB5120998Sep 11, 2026KB5120998 is a cumulative preview update for Windows 11 versions 24H2 and 25H2, released on August 27, 2026 (OS Builds 26200.9278 and 26100.9278). This non-security update delivers production-quality improvements and new features across the Windows interface, including customization options for…
KB5126030Sep 11, 2026KB5126030 is a Setup Dynamic Update released on September 8, 2026, for Windows 11 version 23H2 across all editions. This update addresses security vulnerabilities in Windows setup binaries and files utilized during feature updates. No system restart is required after…
KB5122882Sep 11, 2026KB5122882 is a cumulative security update for Windows Server 2022 released on September 8, 2026 (OS Build 20348.5622). This patch includes the latest security fixes and quality improvements, along with non-security updates from the previous month's optional preview release. It…
KB5120248Sep 11, 2026KB5120248 is a Safe OS Dynamic Update (SafeOS DU) released on August 11, 2026, for Windows 10 Enterprise LTSC 2021 and Windows 10 ESU systems. This update targets improvements to the Windows Recovery Environment (WinRE), which is the recovery partition…
KB5126149Sep 11, 2026KB5126149 is a cumulative security and reliability update for .NET Framework versions 3.5, 4.8, and 4.8.1 on Windows Server 2022, released on September 8, 2026. This patch addresses two critical security vulnerabilities including an elevation of privilege flaw and a…
KB5126047Sep 11, 2026KB5126047 is a cumulative security and reliability update for .NET Framework 4.8 released on September 8, 2026, targeting Windows 10 version 1607 and Windows Server 2016. This update addresses two critical security vulnerabilities and is recommended as part of regular…
KB5126027Sep 11, 2026KB5126027 is a Setup Dynamic Update for Windows Server 2025 released on September 8, 2026. This security-focused update addresses vulnerabilities in Windows setup binaries and files used during feature updates. The patch applies exclusively to Windows Server 2025 systems and…
KB5126048Sep 11, 2026This is a cumulative security update for .NET Framework 3.5 and 4.8 released on September 8, 2026, targeting Windows 10 version 1809 and Windows Server 2019. The update addresses critical security vulnerabilities and provides reliability improvements for .NET Framework components.…
KB5126049Sep 11, 2026KB5126049 is a Security and Quality Rollup for .NET Framework 4.8 released on September 8, 2026, specifically targeting Windows Server 2012. This update addresses critical security vulnerabilities and provides cumulative reliability improvements for the .NET Framework. The patch is part…
KB5121003Sep 11, 2026KB5121003 is the August 2026 cumulative security update for Windows 11 versions 24H2 and 25H2, released on August 11, 2026 (OS Builds 26200.9168 and 26100.9168). This update addresses over 400 security vulnerabilities, including critical zero-day exploits like "LegacyHive," and includes…
KB5126424Sep 11, 2026KB5126424 is a cumulative security and reliability update for .NET Framework 3.5 and 4.8.1 released on September 8, 2026, targeting Windows 11 version 23H2. The update addresses two critical security vulnerabilities and resolves stability issues affecting 64-bit .NET Framework environments.…
KB5126043Sep 11, 2026KB5126043 is a cumulative update for .NET Framework 3.5 and 4.7.2 released on September 8, 2026, targeting Windows 10 version 1809 and Windows Server 2019. This security-focused update addresses critical vulnerabilities in the .NET Framework runtime environment. The update is…
KB5122880Sep 11, 2026KB5122880 is a cumulative security update for Windows 11 version 23H2 released on September 8, 2026 (OS Build 22621.7582). This mandatory patch addresses security vulnerabilities and includes quality improvements from the previous month's preview release. The update affects all editions…
KB5122385Sep 11, 2026KB5122385 is a cumulative update for .NET Framework 3.5 and 4.8.1 released on August 27, 2026, targeting Windows 11 version 25H2 and Microsoft server operating system 24H2. The update addresses reliability improvements and fixes for 64-bit .NET Framework scenarios. According…
KB5122386Sep 11, 2026KB5122386 is a cumulative update for .NET Framework 4.8.1 released on August 27, 2026, designed for Windows 11 version 26H1. This maintenance release delivers security and reliability enhancements to the .NET Framework runtime environment. The update is recommended as part…
KB5120246Sep 11, 2026KB5120246 is a Safe OS Dynamic Update released on August 11, 2026, for Windows 10 version 1607 and Windows Server 2016. This update focuses on improvements to the Windows Recovery Environment (WinRE), which is the system recovery and troubleshooting tool…
KB5124015Sep 11, 2026KB5124015 is a Safe OS Dynamic Update released on September 8, 2026, for Windows 11 versions 24H2 and 25H2. This update focuses on improvements to the Windows Recovery Environment (WinRE), enhancing system recovery capabilities. The update is distributed through Windows…
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