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Microsoft warns June Secure Boot certificate expiry may block boot.

5/18/2026

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Summary

Story summary

Microsoft warned that a Secure Boot certificate will expire in June, affecting most Windows devices without the update.
The update released on May 12, refreshed 24 hours later, may fail to install per a May 15 warning, and may display a red badge that could block boot.
Microsoft said the rollout will be phased, delivering certificates only after devices signal sufficient updates, with the number of affected PCs unknown.

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Story summary

Microsoft warned that a Secure Boot certificate will expire in June, affecting most Windows devices without the update.
The update released on May 12, refreshed 24 hours later, may fail to install per a May 15 warning, and may display a red badge that could block boot.
Microsoft said the rollout will be phased, delivering certificates only after devices signal sufficient updates, with the number of affected PCs unknown.