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flag Microsoft issued December 2025 updates for 54 flaws, including two actively exploited zero-days affecting Windows, Office, and GitHub Copilot.

flag Microsoft released December 2025 updates addressing 54 vulnerabilities, including two actively exploited zero-days. flag CVE-2025-62221, a Windows Cloud Files driver flaw, allows attackers to gain SYSTEM-level access with local code execution and is already in use. flag CVE-2025-54100 bypasses Windows’ Mark of the Web protection, enabling malicious code execution before file saves, primarily affecting PowerShell 5.1, which now requires user prompts. flag A flaw in GitHub Copilot for JetBrains (CVE-2025-64671) could allow arbitrary command execution via AI code suggestions. flag Two Office vulnerabilities (CVE-2025-62554, CVE-2025-62557) enable remote code execution just by previewing malicious emails or files. flag The batch excludes browser and open-source patches, previously addressed in December. flag PowerShell 7 is unaffected; users of PowerShell 5.1 should use the -UseBasicParsing parameter to avoid script issues. flag Organizations are urged to prioritize patching due to active exploitation and high-risk potential.

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