Microsoft Warns Secure Boot May Be Bypassed as Windows UEFI Certificates Expire

Microsoft has addressed a critical security feature bypass vulnerability in Windows Secure Boot certificates, tracked as CVE-2026-21265, through its January 2026 Patch Tuesday updates. The flaw stems from expiring 2011-era certificates that underpin Secure Boot’s trust chain, potentially allowing attackers to disrupt boot integrity if unpatched. Rated Important with a CVSS v3.1 base score of […]

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