
Windows 11 26H1 Security Update Expands Secure Boot Certificate Protection
Microsoft's Windows 11 26H1 update KB5124012 widens Secure Boot certificate deployment and patches two elevation flaws.
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Microsoft's Windows 11 26H1 update KB5124012 widens Secure Boot certificate deployment and patches two elevation flaws.

Microsoft confirms September 2026 Windows updates trigger domain trust failures via Machine Identity Isolation and shares a workaround for Windows 11 enterprises.
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