Windows Security Certificates Expire June 2026: Check Your PC Now or Risk Boot Failure
Critical Windows security certificates are set to expire in June 2026, affecting over a billion PCs. Learn how to check your system and avoid security degradation.
Windows Security Certificates Expire June 2026: Check Your PC Now or Risk Boot Failure
summarize3-Point Summary
- 1Critical Windows security certificates are set to expire in June 2026, affecting over a billion PCs. Learn how to check your system and avoid security degradation.
- 2If your system relies on the original 2016 Secure Boot signing certificates, you could face boot failures, blocked Windows Updates, or vulnerability to bootkit attacks.
- 3Microsoft warns that devices still on Windows 10 without Extended Security Updates will enter a degraded security state—making immediate action essential.
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Windows Security Certificates Expire June 2026: Check Your PC Now or Risk Boot Failure
Windows security certificates are set to expire in June 2026, threatening the integrity of Secure Boot on over a billion PCs worldwide. If your system relies on the original 2016 Secure Boot signing certificates, you could face boot failures, blocked Windows Updates, or vulnerability to bootkit attacks. Microsoft warns that devices still on Windows 10 without Extended Security Updates will enter a degraded security state—making immediate action essential.
What Are Windows Security Certificates and Why Do They Matter?
Windows security certificates authenticate the boot process through Microsoft Secure Boot, ensuring only trusted firmware and OS loaders execute. These certificates, issued in 2016, have a 10-year lifespan and are embedded in UEFI firmware. Once expired, systems may refuse to boot, display warning messages, or lose access to Microsoft Defender and Windows Update.
How to Check Your Secure Boot Certificate Status
Open Command Prompt as administrator and run certlm.msc. Navigate to Trusted Root Certification Authorities > Certificates. Look for entries issued by Microsoft Corporation or Microsoft Root Certificate Authority with expiration dates around June 2026. If any expire within 90 days, your system is at risk.
Windows 10 vs Windows 11: Which Needs Action?
Windows 10 systems without Extended Security Updates (ESU) are at highest risk after October 2025. Even Windows 11 devices can be affected if their firmware uses outdated UEFI certificates from older hardware. Microsoft recommends upgrading to Windows 11, which uses newer cryptographic standards and updated root keys. ESU is not a long-term fix—it’s a temporary bridge.
What to Do If You’re Running Legacy Hardware
Enterprise users in healthcare, manufacturing, or public infrastructure must coordinate with OEMs to confirm firmware update availability. Some vendors have already shipped devices with renewed certificates, but legacy systems may need manual BIOS/UEFI updates. Check your manufacturer’s support page for firmware updates dated after January 2025.
Why Microsoft Won’t Patch These Certificates
Microsoft has not released a public patch to extend the 2016 certificates because doing so would undermine cryptographic security principles. Instead, the company pushes users toward modern OS versions with stronger, longer-lived keys. Delaying upgrades increases exposure to undetectable boot-level malware.
The June 2026 deadline is not arbitrary—it’s the end of a decade-long cryptographic lifecycle. Ignoring this could render your PC unusable. Update your operating system, install pending firmware updates, and migrate to Windows 11 if you’re still on Windows 10. Don’t wait until your PC refuses to boot—act today.
