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9.5CRITICAL

Microsoft's Original Windows Secure Boot Certificate Is Expiring

📅 16 April 2026 at 15:16 UTC📰 Dark ReadingView original source ↗

The Secure Boot refresh is one of the largest coordinated security maintenance efforts across the Windows ecosystem, Microsoft said. Update those PCs soon.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

Microsoft is warning users that the original Windows Secure Boot certificate is expiring, prompting a coordinated security maintenance effort across the Windows ecosystem. This expiration poses a significant risk to systems relying on Secure Boot for boot-time validation.

⚙️Technical Details
Affected Systems
Windows operating systems
Attack Vectors
Boot-time validation vulnerabilitySecure Boot mechanism
💥Impact Assessment
Severity: c
Who Is at Risk
Users of Windows operating systems relying on Secure Boot for boot-time validation
🛡️Recommended Actions
1['Update the Secure Boot firmware to the latest version', "Verify and update the system's Trusted Platform Module (TPM) settings", 'Apply a patch or update to fix the boot-time validation vulnerability']
📦Affected Products
Windows operating systems

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