certificate updates Archives

Winsage

May 26, 2026

FAQ: What you need to know about expiring Windows Secure Boot certificates

Secure Boot is a security mechanism that authenticates firmware-based software through trusted certificates during the startup process of Windows, preventing unauthorized code execution. It is part of the UEFI firmware standard and was introduced in 2011 to allow only verified, signed code to run at startup. Microsoft first implemented Secure Boot certificates in 2011 as an optional feature in Windows 8, and it remained optional in Windows 10. However, it became a mandatory requirement with the launch of Windows 11 in 2021, indicating the widespread adoption of UEFI systems.

Winsage

May 21, 2026

Windows 11’s new SecureBoot folder isn’t malware. Here’s what it does

Users have observed a new folder named “SecureBoot” in the Windows system folder following the installation of Windows 11's May update (KB5089549). This update may cause installation issues for some devices and introduces a directory that contains example scripts for IT professionals to manage Secure Boot certificate updates. Windows Secure Boot certificates are set to expire next month, and outdated certificates will lead to loss of support starting in June, potentially compromising Secure Boot functionality. Microsoft is distributing new certificates through Windows Update. The SecureBoot folder does not require individual users to take action, and deleting it is discouraged as it may cause complications with future Windows updates.

Winsage

May 10, 2026

‘One Time Restart’—Microsoft Changes Windows After 15 Years

Microsoft is implementing changes to Secure Boot certificates for Windows PCs, marking the first expiration since 2011. New certificates must be installed on all devices before a deadline in June. Users can check their status via the Windows Security App. The new certificates will be distributed through regular monthly security updates, with some users already receiving them in April and others expected to see changes in May. Following these updates, users may experience additional restarts on their PCs. The update applies only to PCs eligible for security updates, meaning many Windows 10 PCs will not receive the new certificates, potentially exposing them to risks. Affected users are advised to enroll in Microsoft’s Extended Security Update (ESU) program.

Winsage

May 5, 2026

Microsoft confirms Windows 11 may restart multiple times after updates and your PC isn’t broken, as it’s due to Secure Boot 2023

Upon installing the April 2026 Patch Tuesday update, some users experienced two or three reboots, which Microsoft confirmed is intentional due to the installation of Secure Boot 2023 certificates. This behavior is expected for a limited number of devices and is part of the Secure Boot update process. The Secure Boot certificates are replacing older ones issued in 2011, set to expire in June 2026. Users can check their Secure Boot status in the Windows Security app, which indicates the status with green, yellow, or red badges. A green badge means the system is up to date, while yellow and red badges indicate issues with certificate updates. Microsoft is managing Secure Boot certificates on modern PCs, but older machines without OEM support may struggle to receive updates due to firmware limitations.

Winsage

April 22, 2026

Microsoft Changes Windows Security After 15 Years—Update By ‘End Of April’

Microsoft is set to expire the Secure Boot authentication certificates that protect Windows PCs from threats upon each restart, with this initiative beginning in April 2023. The update will install new certificates and confirm if user action is necessary, with all devices expected to have the update by the end of April 2026. Users can check their Secure Boot status in Windows Security, where a badge system indicates the status. If the certificates expire, users may be at risk of boot-level malware. Microsoft is enhancing visibility of Secure Boot certificate status to aid user awareness. Users should check their PC by the end of the month to ensure it is updated.

Winsage

April 16, 2026

Microsoft’s latest Windows update now confirms if your PC is Secure Boot-protected

Microsoft has introduced a new feature in Windows 11 and Windows 10 that informs users about the status of Secure Boot as part of the April Patch Tuesday update. This feature includes a visual indicator that shows whether devices have the latest Secure Boot certificates, which protect against bootkit malware. The Secure Boot icon can display in green, yellow, or red, indicating different security statuses: green means secure with no actions needed, yellow indicates a pending safety recommendation, and red signals that immediate attention is required. Users can check their Secure Boot status through Settings in both operating systems. It is important to install the latest Windows updates to ensure devices have the most recent Secure Boot certificates, as older certificates will expire in June. The April updates also address 164 vulnerabilities, including eight classified as critical and two identified as zero-day flaws. Users are advised to prioritize these updates to maintain system security.

Winsage

April 2, 2026

Microsoft Provides a Secure Boot Certificate Update

Microsoft will roll out new Secure Boot certificates starting in April 2026, allowing users to access and understand their Secure Boot certificate status through the Windows Security app. This feature will be found under the Device security section in the Secure Boot area. Users with PCs manufactured in 2024 or later will have the necessary certificates, while older models will receive updates via Windows Update. The Windows Security app will use a color-coded system to indicate certificate status: a green check box for up-to-date certificates, a yellow bang for safety recommendations, and a red stop icon for critical issues. Further enhancements, including notifications and in-app guidance, will be introduced in May. Resources for IT administrators are available on Microsoft Support.

Winsage

March 11, 2026

I tested Windows 11 March 2026 Updates: Everything new, improved, and fixed

Microsoft has rolled out the March 2026 Patch Tuesday update for Windows 11 (KB5079473, Build 26200.8037) and Windows 10, focusing on enhancements and functional upgrades. The update applies to Windows 11 versions 25H2 and 24H2, introducing new features, security enhancements, system fixes, and reliability improvements. Key features include: - Support for Emoji 16.0, allowing users to insert new emojis through the Emoji panel. - Windows Backup restore adapted for organizational use, enabling restoration of user settings and applications during sign-in. - Quick Machine Recovery (QMR) enabled by default on more Windows 11 Pro PCs. - A Bing-powered Internet speed test tool accessible from the taskbar. - Sysmon included as a native component for system activity monitoring. - Support for WebP images as desktop wallpapers. - Remote Server Administration Tools (RSAT) supported on Windows 11 Arm64 devices. - Minor enhancements in Accounts and Camera settings. The update also includes reliability and stability improvements, such as enhanced responsiveness of the Windows Update settings page, improved sign-in screen reliability, and better performance for the Windows printing service. It lays groundwork for Secure Boot certificate updates and addresses BitLocker reliability issues. Additionally, internal AI components have been updated, and a servicing stack update (SSU) has been released to enhance Windows Update infrastructure reliability. Microsoft is also expanding the updated Start menu and battery icons to more devices and warns users about the importance of updating Secure Boot certificates before their expiration in June 2026.

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.

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.