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Forgotten UEFI shims undermining Secure Boot
July 14, 2026 · WeLiveSecurity · Severity: HIGH
ESET researchers discovered 11 vulnerable UEFI shim bootloaders signed by Microsoft. These bootloaders can be exploited to bypass UEFI Secure Boot, undermining a critical security feature.
Key Takeaways
- ESET found 11 vulnerable UEFI shim bootloaders signed by Microsoft.
- These bootloaders allow attackers to bypass UEFI Secure Boot protections.
- The discovery highlights risks in the Secure Boot chain of trust.