Microsoft's Patch Tuesday Fixes 63 Windows Vulnerabilities

Microsoft's Patch Tuesday for November 2025 addresses 63 vulnerabilities across its product suite, including Windows 11, Office, and Edge.

Vulnerabilities and Security Fixes

The update includes fixes for four critical vulnerabilities and 59 important ones. Notable is a critical heap-based buffer overflow that allows remote code execution with a CVSS score of 9.8. Other significant patched flaws involve Windows Kerberos and the Windows Subsystem for Linux GUI.

• A privilege-escalation issue grants admin rights.
• A CVSS 9.8 buffer overflow poses remote code execution threats.
• Windows Kerberos flaw affects Active Directory.

Windows 11 Updates

Windows 11 updates include a revamped Start menu, taskbar improvements, and enhancements to File Explorer and Voice Access. A new security preview, Administrator Protection, requires admin approval for system-level actions and can be enabled in Windows Security or via Group Policy.

Recommendations and Best Practices

Organizations are advised to thoroughly test updates before deployment to avoid disruptions yet apply them promptly to mitigate security risks. Microsoft's built-in backup tools are recommended before applying patches. The updates also include a Windows 10 Extended Security Update for ESU-enrolled devices.

Update: 17 Jun 2026