Microsoft Releases December 2025 Windows Update: Addresses Critical Office Vulnerabilities
Microsoft Releases December 2025 Windows Update: Addresses Critical Office Vulnerabilities
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Microsoft Releases December 2025 Windows Update: Addresses Critical Office Vulnerabilities
Major security patches deployed across Windows and Office products, including three critical flaws
Microsoft released its monthly security updates on December 9, 2025, delivering patches for all currently supported versions of Windows as part of its regular Patch Tuesday cycle.
The updates are now available through Windows Update and the Windows Update Catalog, addressing a total of 70 vulnerabilities (CVE-based, including third-party issues) across Windows and other Microsoft products.
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Active Exploitation and Public Disclosure
Among the patched vulnerabilities, one zero-day flaw is already being actively exploited in the wild:
CVE-2025-62221: Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Two additional vulnerabilities have had their exploit methods publicly disclosed:
- CVE-2025-64671: GitHub Copilot for JetBrains Remote Code Execution Vulnerability
- CVE-2025-54100: PowerShell Remote Code Execution Vulnerability
While both disclosed vulnerabilities carry an “Important” severity rating rather than “Critical,” they still warrant careful attention. Notably, the patch for CVE-2025-54100 adds a security confirmation prompt to PowerShell’s Invoke-WebRequest command, which may cause some scripts to pause for user interaction.
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Critical Office Vulnerabilities Demand Urgent Action
Three vulnerabilities received the highest “Critical” severity rating, all affecting Microsoft Office and Outlook:
- CVE-2025-62554: Microsoft Office Remote Code Execution Vulnerability
- CVE-2025-62557: Microsoft Office Remote Code Execution Vulnerability
- CVE-2025-62562: Microsoft Outlook Remote Code Execution Vulnerability
Security experts recommend prioritizing these Office updates, as the critical severity indicates these flaws could allow attackers to execute arbitrary code remotely, potentially compromising entire systems.
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Windows Updates: Final Patches of 2025
This marks the last Windows security update of the year, as Microsoft will not release preview patches later this month due to the holiday season. The maximum severity rating for Windows updates is “Important” (remote code execution).
Updates are available for:
- Windows 11 versions 25H2 and 24H2: KB5072033
- Windows 11 version 23H2: KB5071417
- Windows 10 version 22H2: KB5071546
- Windows Server 2025: KB5072033
- Windows Server 2022: KB5071547
- Windows Server 2019: KB5071544
- Windows Server 2016: KB5071543
Important note: Windows 10 version 22H2 has reached end of support for general users. Those not enrolled in Extended Security Updates (ESU) will no longer receive security patches.
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Windows 11 25H2 Improvements
The Windows 11 version 25H2 update (which shares patch content with version 24H2) includes several noteworthy fixes:
- Resolution for “Ask Copilot” failing to properly launch the “Click to Do” window, ensuring the window now appears in the foreground when sharing data with Copilot
- Fix for File Explorer briefly flashing white during page transitions
- Resolution for external virtual switches losing physical network adapter (NIC) bindings after host restarts
Microsoft notes that some features will roll out gradually to targeted user groups, meaning not all improvements may be immediately available after updating.
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Other Microsoft Products Receive Security Fixes
SharePoint: Four vulnerabilities patched, all rated “Important” for remote code execution (CVE-2025-62555, CVE-2025-62558, CVE-2025-62559, CVE-2025-62562)
Exchange Server: Two vulnerabilities addressed:
- CVE-2025-64666 (Important: Elevation of Privilege)
- CVE-2025-64667 (Important: Spoofing)
Microsoft Edge: Updated independently of Patch Tuesday; latest security release is version 143.0.3650.66 (December 4, 2025)
Office for Android: Two critical vulnerabilities patched
GitHub Copilot Plugin for JetBrains IDEs: One important vulnerability fixed
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Recommendations
Organizations and individual users should apply these updates promptly, particularly:
- The three critical Office/Outlook vulnerabilities that could enable remote code execution
- The actively exploited Windows Cloud Files vulnerability
- The two publicly disclosed vulnerabilities in PowerShell and GitHub Copilot
System administrators should test the PowerShell security prompt changes in non-production environments before deployment, as the new confirmation dialogs may affect automated scripts.
With the holiday season approaching and this being the final update of 2025, ensuring all systems are patched before the new year is especially important for maintaining security posture during what is typically a period of reduced IT staffing.
