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Microsoft-signed UEFI shim bootloaders vulnerable to Secure Boot bypass

🗓️ 09 Jun 2026 00:00:00Reported by CERTType 
cert
 cert
🔗 www.kb.cert.org👁 4 Views

Microsoft signed UEFI shim bootloaders up to version 0.9 enable Secure Boot bypass and will be added to the Forbidden Signature Database.

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10 Jun 2026 17:26Current
6.4Medium risk
Vulners AI Score6.4
CVSS 3.17.8
EPSS0.00005
SSVC
4