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August 12, 2025—KB5063899 (OS Build 25398.1791)

🗓️ 12 Aug 2025 07:00:00Reported by MicrosoftType 
mskb
 mskb
🔗 support.microsoft.com👁 9 Views

Secure Boot certificates expire June 2026; update now to avoid boot issues on OS Build 25398.1791.

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12 Aug 2025 07:00Current
10High risk
Vulners AI Score10
CVSS 3.19.8
EPSS0.25164
SSVC
9