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Microsoft Updates Secure Boot Certificates for Windows 11 Systems

Microsoft Updates Secure Boot Certificates for Windows 11 Systems

First seen 13 Jan 2026, 21:45 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

Microsoft has begun automatically replacing expiring Secure Boot certificates on eligible Windows 11 24H2 and 25H2 systems. This update is crucial for maintaining the integrity of the Secure Boot feature, which prevents malicious software from executing during system startup by verifying trusted bootloaders. Devices with affected certificate versions must update to ensure continued Secure Boot functionality and security fixes.

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