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Microsoft Secure Boot certificate expiration guidance for Windows devices

Advisory/Mitigation
First reported
Last updated
Happening score
H score 55
2 unique sources, 3 articles

Summary

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Microsoft warned that Secure Boot certificates used by most Windows devices expire starting in June 2026, creating a risk that some personal and business systems may not boot securely. The company said affected devices could face boot disruption if the certificates are not updated in time. Microsoft urged customers to review the guidance and update certificates in advance to avoid that disruption.

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Timeline

  1. 10.02.2026 21:06 2 articles · 3mo ago

    Microsoft continues Secure Boot certificate rollout in Windows 10 KB5075912

    Mitigation Patch Update

    Microsoft released Windows 10 KB5075912 and continues rolling out replacement Secure Boot certificates to targeted Windows devices through monthly Windows updates, expanding delivery only after devices show sufficient successful update signals ahead of the June 2026 expiration.

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  2. 14.01.2026 11:38 2 articles · 4mo ago

    Microsoft Secure Boot certificate expiration guidance for Windows devices

    Initial Disclosure

    Microsoft issued advance guidance for expiring **Secure Boot certificates** on **Windows devices** ahead of the **June 2026** deadline. The initial phase is a proactive mitigation effort aimed at preventing secure-boot disruption before certificate expiry takes effect.

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