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September 9, 2025—KB5065426 (OS Build 26100.6584)

🗓️ 14 Oct 2025 14:00:00Reported by MicrosoftType 
mskb
 mskb🔗 support.microsoft.com👁 16 Views

Update KB5065426 secures Windows by addressing Secure Boot cert expiry in June 2026 and system interrupt state issues.

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14 Oct 2025 14:00Current
7.8High risk
Vulners AI Score7.8
CVSS 3.18.8 - 9.8
EPSS0.18834
SSVC
secure bootcertificate expirationjune 2026security updateinterrupt state issue
16