KB5072033: fixes an issue where external virtual switches lose their physical network adapter

December 9, 2025—KB5072033 (OS Builds 26200.7462 and 26100.7462)

Highlights

• This update addresses security issues for your Windows operating system.

Improvements
This security update contains fixes and quality improvements from KB5070311 (released December 1, 2025). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.

• [Copilot] Fixed: This update addresses an issue where Ask Copilot didn’t activate the Click to Do window as expected. The window now appears in the foreground when you share data with Copilot.
• [File Explorer (known issue)] Fixed: This update addresses an issue where File Explorer briefly flashes white when you navigate between pages. This issue might occur after you install KB5070311.
• [Networking] Fixed: This update fixes an issue where external virtual switches lose their physical network adapter (NIC) bindings after a host restart. When this happens, the switches revert to internal mode, resulting in loss of network connectivity for virtual machines and blocking normal server operations. ​​​​​​​
• [PowerShell 5.1] Invoke-WebRequest now includes a confirmation prompt with a security warning of script execution risk. You can choose to continue or cancel the request. For additional details, see CVE-2025-54100 and KB5074596: PowerShell 5.1: Preventing script execution from web content.

If you've already installed previous updates, your device will download and install only the new updates included in this package.