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August 12, 2025—KB5063878 (OS Build 26100.4946)

🗓️ 12 Aug 2025 07:00:00Reported by MicrosoftType 
mskb
 mskb🔗 support.microsoft.com👁 15 Views

KB5063878: Secure Boot certificates expire June 2026; update now; fixes sign in delays.

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12 Aug 2025 07:00Current
7.1High risk
Vulners AI Score7.1
CVSS 3.19.8
EPSS0.38176
SSVC
windows secure bootcertificate expirationjune 2026update certificatessign in delayssecurity updateoperating system build .
15