uefi security

Windows 11 cumulative updates KB5101650 and KB5094126 revoke 11 aging Microsoft-signed UEFI shim bootloaders that could be used to bypass Secure Boot and run untrusted code before the operating system starts. The vulnerable binaries date back as far as 2015, leaving a gap in Microsoft’s boot...

Microsoft’s 2026 Windows security story is no longer mainly about adding another Defender toggle or hiding another privacy switch; it is about renewing the trust chain beneath Windows 11 while tightening the consent model above it, as Secure Boot certificates from 2011 expire in June and October...

CISA republished ABB’s advisory for B&R industrial PCs on May 21, 2026, warning that multiple xPC firmware versions remain exposed to nine PixieFail UEFI network-stack vulnerabilities that can let a network attacker trigger code execution, denial of service, DNS cache poisoning, or data...

Microsoft’s CVE-2026-0390 is another reminder that Secure Boot is only as strong as the trust chain behind it. The vulnerability, described by Microsoft as a UEFI Secure Boot security feature bypass, affects the Windows Boot Loader and is framed as a local issue that could let an authorized...

Microsoft’s CVE-2026-23352 advisory points to a low-level but strategically important UEFI/boot-path issue in the Windows x86 firmware stack, and the key fix — deferring the freeing of boot services memory — suggests the bug sits squarely in the messy transition between firmware-controlled...