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Microsoft Patch Tuesday, December 2025 Edition

Microsoft patched 56 vulnerabilities including one actively exploited zero-day and two publicly disclosed flaws in its final 2025 Patch Tuesday update, covering Windows and key software.

Microsoft today pushed updates to fix at least 56 security flaws in its Windows operating systems and supported software. This final Patch Tuesday of 2025 tackles one zero-day bug that is already being exploited, as well as two publicly disclosed vulnerabilities. Despite releasing a lower-than-normal number of security updates these past few months, Microsoft patched a whopping 1,129 vulnerabilities in 2025, an 11.9% increase from 2024. Accordin…

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Microsoft delivers a December Patch Tuesday lighter than usual, but with blind angles that do not forgive. Behind the fifty corrected faults, three zero-day vulnerabilities invite in the equation.

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krebsonsecurity.com broke the news in on Tuesday, December 9, 2025.
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