Microsoft Warns Unpatched Windows 11 PCs Face June 2026 Secure Boot Block
Secure Boot, a feature first launched in 2011 with Windows 8, included an initial wave of certificates that are set to expire starting on June 24th. We've covered this before, but Microsoft is renewing its warning with the deadline now less than a month away. While an expired Secure Boot certificate will not prevent the PC from functioning normally, it will open up the system to additional vulnerabilities and may cause Secure Boot-dependent software, hardware, and firmware to stop functioning.
For most users, applying the new Secure Boot updates should be as simple as running Windows Update. Windows 10 users that have not opted into the ESU, as well as a number of Windows 11 users not included in the initial Windows Update wave, may be required to manually apply a BIOS update in order to apply new Secure Boot certificates. Ahead of this looming deadline, Microsoft also hosted...
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