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Windows 10/11 Patch Day March: Microsoft delivers the big security update, but as usual, the real message is in the fine print
Winsage
March 12, 2026

Windows 10/11 Patch Day March: Microsoft delivers the big security update, but as usual, the real message is in the fine print

In March, Microsoft released cumulative security updates for Windows 10 and Windows 11, with support for certain versions continuing until March 2026. The updates include KB5079466 for Windows 11 version 26H1, KB5079473 for versions 24H2 and 25H2, KB5078883 for version 23H2, and KB5078885 for Windows 10 version 22H2. These updates will be distributed via Windows Update, the Microsoft Update Catalog, and WSUS for enterprise environments. This month, Microsoft combined the Servicing Stack Update (SSU) with the Latest Cumulative Update, simplifying the update process. Key enhancements include improvements to Secure Boot, with expanded device target data for new certificates, and security enhancements for Explorer’s search functionality in Windows 11 versions 24H2 and 25H2. A fix for Windows Defender Application Control (WDAC) was also implemented, addressing issues with COM objects under certain policy configurations. The Windows System Image Manager received a new warning dialog for confirming the trustworthiness of catalog files, which is important for enterprise environments. Updates for Windows 10 22H2, despite its end-of-life status, included fixes for secure boot issues and improvements for file version history in the Control Panel. An SSU for Windows 11 (KB5077869) was also released to maintain update stability. Microsoft's updates scheduled for March 2026 will address vulnerabilities in components like the Windows App Installer, SQL Server, and Microsoft Office. The Security Update Guide provides detailed information on specific vulnerabilities and affected components.
Microsoft releases Windows 10 KB5078885 extended security update
Winsage
March 11, 2026

Microsoft releases Windows 10 KB5078885 extended security update

Microsoft has released the Windows 10 KB5078885 extended security update, which addresses vulnerabilities identified during the March 2026 Patch Tuesday. This update resolves two zero-day vulnerabilities and a critical issue preventing certain devices from shutting down properly. Users of Windows 10 Enterprise LTSC or those in the ESU program can install it via Settings under Windows Update. The update upgrades Windows 10 to build 19045.7058 and Windows 10 Enterprise LTSC 2021 to build 19044.7058. The update focuses on security enhancements and bug fixes, addressing a total of 79 vulnerabilities, including two actively exploited ones. Key fixes include: - A new warning dialog in Windows System Image Manager for confirming trusted catalog files. - Enhancements to File History for backing up files with specific Chinese and Private Use Area characters. - Stability improvements for specific GPU configurations. - Additional high-confidence device targeting data for Secure Boot certificates. - Adjustments to Chinese fonts for compliance with GB18030-2022A standards. - A fix for Secure Launch-capable PCs with Virtual Secure Mode unable to shut down or hibernate after a previous security update. - Resolution of an issue affecting folder renaming with desktop.ini files in File Explorer. The update also addresses a known issue preventing Windows 10 devices from shutting down or hibernating when System Guard Secure Launch is enabled. Microsoft is deploying new Secure Boot certificates to replace those expiring in June 2026, which are crucial for validating boot components and preventing security risks. There are currently no known issues associated with this update.
Microsoft's Secure Boot certificates expire in June 2026, but older PCs may never get the fix
Winsage
March 7, 2026

Microsoft’s Secure Boot certificates expire in June 2026, but older PCs may never get the fix

Every Secure Boot-enabled Windows PC relies on cryptographic certificates issued by Microsoft in 2011, embedded in the motherboard's firmware, to ensure a secure boot process. The first of these certificates will expire on June 24, 2026, which will affect the ability to receive future security updates for critical components of the Windows startup process. Microsoft is rolling out replacement certificates through Windows Update, marking a significant security maintenance effort. Secure Boot operates as a chain of trust with certificates stored in the motherboard's UEFI firmware, validating software before the operating system loads. The Platform Key (PK) is at the top of this chain, followed by the Key Exchange Key (KEK) and the Signature Database (DB). The replacement certificates introduced in 2023 restructure certificate management, separating responsibilities among different certificate authorities to enhance the trust model. Not all PCs are affected by the upcoming expiration; newer devices manufactured since 2024 already have the new certificates. Windows 10 users face challenges as support for this version ends in October 2025, and they will not receive the new certificates unless enrolled in Extended Security Updates. Home users should ensure their PCs are set to receive updates automatically, while enterprise environments require coordination for firmware updates before the Windows certificate update.
silver Android smartphone
Winsage
March 6, 2026

Microsoft’s Secure Boot certificates expire in June 2026, but older PCs may never get the fix

Every Secure Boot-enabled Windows PC relies on cryptographic certificates issued by Microsoft in 2011 for boot process integrity. The first of these certificates will expire on June 24, 2026, impacting the ability to receive future security updates. Microsoft is rolling out replacement certificates through Windows Update, requiring collaboration between Microsoft, PC manufacturers, and users. Three critical certificates will expire: the Microsoft Corporation KEK CA 2011 and Microsoft UEFI CA 2011 in June 2026, and the Microsoft Windows Production PCA 2011 in October 2026. The new certificates introduced in 2023 have a restructured functionality to enhance security. Not all PCs are affected; newer devices manufactured since 2024 come with the new certificates. Windows 10 users face challenges as support ends in October 2025, and unsupported devices will not receive updates. Home users should ensure automatic Windows updates and check for firmware updates, while enterprise environments must verify firmware updates before applying certificate updates. The first certificate expiration is on June 27, 2026.
Microsoft confirms a wider roll out of Windows 11's new colourful battery icons on the taskbar
Winsage
February 28, 2026

Microsoft confirms a wider roll out of Windows 11’s new colourful battery icons on the taskbar

Windows 11 users will see colorful battery icons on the taskbar as Microsoft rolls out updates, including the new Start menu, with the update KB5077241. The vibrant battery icons have been in development for nearly two years, with initial testing starting in late 2024. The rollout began last year but was limited to select PCs. An optional update in February 2026 will further expand the availability of these icons and the updated Start menu. The new battery icon replaces the plain white bar with a green icon when charging, featuring a charging bolt during the process. The icon changes color based on battery levels: it turns orange at 30% and red below 6%. Users can display the battery percentage on the taskbar by enabling it in Settings > System > Power & Battery. Recent improvements to the Windows taskbar include the return of drag-and-drop functionality, the ability to resize the taskbar, and potential options to reposition it. Microsoft is also updating Secure Boot certificates, set to expire in June 2026, and distributing new certificates issued in 2023 to more PCs. A tutorial is available for users to verify the application of these new Secure Boot certificates.
Prepare your servers for Secure Boot certificate updates
Winsage
February 23, 2026

Prepare your servers for Secure Boot certificate updates

Windows Server administrators should update Secure Boot certificates before the June 2026 expiration date. Microsoft has held Secure Boot Ask Microsoft Anything (AMA) sessions in December 2025 and February 2026, with recordings available for those who missed them. Upcoming AMAs are scheduled for March and April. Administrators are encouraged to follow Windows Events on the Microsoft Tech Community and bookmark the Windows Secure Boot certificate updates page for centralized guidance and resources.
Windows 10 ESU update KB5075912 bumps 22H2 to Build 19045.6937
Winsage
February 19, 2026

Windows 10 ESU update KB5075912 bumps 22H2 to Build 19045.6937

Microsoft has announced an update, identified as KB5075912, regarding Secure Boot certificates to enhance device security for Windows users. Key points include the introduction of new certificates to prevent unauthorized software during startup, improved compatibility with various hardware configurations, and a commitment to provide regular updates to these certificates.
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