Long-Lived Vulnerability in Microsoft Secure Boot

· Bruce Schneier · July 29, 2026, 11:05 a.m.
Firmware microsoft Vulnerabilities Cybersecurity microsoft Firmware Vulnerabilities
Summary
Microsoft's Secure Boot has had a significant vulnerability for 13 of its 14 years, allowing novice hackers to bypass protection due to defective firmware images called shims that were never revoked despite known issues. This exploit highlights a critical lapse by Microsoft.
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