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VulnerabilitiesApr 16, 2026

Microsoft's Original Windows Secure Boot Certificate Is Expiring

Microsoft's original Windows Secure Boot certificate expires soon; coordinated refresh required across ecosystem.

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Summary

Microsoft's original Windows Secure Boot certificate is set to expire, prompting a large-scale coordinated security maintenance effort across the Windows ecosystem. The company is urging system administrators and users to update their PCs promptly to avoid potential boot and compatibility issues. This refresh represents one of the largest coordinated certificate updates in Windows history.

Entities

Microsoft (vendor)Windows (product)Secure Boot (technology)