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VulnerabilitiesJul 15, 2026

Forgotten Bootloaders Expose Secure Boot Blind Spot

Vulnerable UEFI shim bootloaders bypassed Secure Boot for years.

Summary

Researchers discovered that nearly a dozen UEFI shim bootloaders, which are crucial for the Secure Boot process, were vulnerable and remained trusted for years. These vulnerabilities allowed attackers to bypass Secure Boot, a critical security feature designed to prevent malicious software from loading during the boot process. The affected bootloaders have since been revoked.

Entities

UEFI shim bootloaders (technology)Secure Boot (technology)