Microsoft's 2011 Secure Boot Certificates Are Expiring and Most Windows Users Don't Know It
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- 4 May 2026
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Discussion of the blog article Microsoft's 2011 Secure Boot Certificates Are Expiring and Most Windows Users Don't Know It.
Microsoft is displaying escalating Secure Boot warnings starting May 13 (Windows 10) and May 16 (Windows 11). The original 2011 certificates expire in October 2026. Unpatched systems may refuse to boot. Here's the full technical picture and what to do.
Discussion thread — share findings, corrections and follow-ups below.