Microsoft releases Windows 10 KB5099539 extended security update

Microsoft released the Windows 10 KB5099539 extended security update, which includes the July 2026 Patch Tuesday updates addressing a record 570 vulnerabilities, including two actively exploited and one publicly disclosed zero-day flaws. The update improves security features such as Secure Boot reporting and enforces TDI transport registration requirements, potentially affecting legacy applications. No active threat campaigns or malicious indicators are described in the article.

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