Windows 10 KB5071546 Update: Key Details and Insights

Windows 10 KB5071546 is now available, and I tested it on my PC enrolled in the Extended Security Update (ESU) program. As anticipated, the December 2025 patch for Windows 10 does not introduce new features, but it remains a critical download due to its security fixes. Microsoft has also provided direct download links for the KB5071546 offline installer.

Update Overview

KB5071546 is classified as a mandatory update and appears as “2025-12 Cumulative Update for Windows 10 Version 22H2 for x64-based Systems (KB5071546)” for users who have signed up for ESU. This update upgrades PCs to Windows 10 Build 19045.6691 or 19044.6691.

In our tests, the update process—from download to installation—took approximately five minutes. While Microsoft has not disclosed specific details about the fixes, our research indicates that the update addresses 57 security issues, including at least two zero-day vulnerabilities, one of which is actively exploited. This makes the December patch particularly critical for maintaining system security.

Key Fixes in Windows 10 KB5071546

• Addresses vulnerabilities in PowerShell that allowed attackers to exploit scripts embedded in webpages.
• Fixes bugs related to code execution via PowerShell’s Invoke-WebRequest command.

PowerShell-Related Changes in KB5071546

Microsoft has resolved a bug where PowerShell scripts embedded in a webpage could be exploited when executed. When using the Invoke-WebRequest command, the tool parses the webpage’s content, and previously, attackers exploited certain elements in the command to execute malicious code locally.

Following the update, users will now encounter the following warning when using Invoke-WebRequest:

“Invoke-WebRequest parses the content of the web page. Script code in the web page might be run when the page is parsed. RECOMMENDED ACTION: Use the -UseBasicParsing switch to avoid script code execution.”

This warning is purely informational and does not block the command from running. Users can choose to ignore it and proceed. A similar fix is also available for Windows 11 with KB5072033.

Direct Download Links for KB5071546

Microsoft has provided direct download links for the KB5071546 offline installer. These links are available for both 64-bit and ARM-64 systems. While you can use the Microsoft Update Catalog to download offline installers, they will only function if you have enrolled in Windows 10 ESU. Enrollment is highly recommended for continued security updates.

How to Enroll in Windows 10 ESU

1. Open the Windows Update settings on your PC.
2. Look for the new “Enroll now” button and select it.
3. Follow the wizard to complete the Windows 10 ESU enrollment. Ensure you are signed in with a Microsoft account for automatic registration.

Users can also opt for a paid ESU subscription at $29.99, which provides one year of updates even when using a local account.

Conclusion

While the KB5071546 update does not include new features, it is essential for addressing critical security vulnerabilities, especially zero-day exploits. Users are strongly encouraged to sign up for ESU and download the update to ensure their systems remain protected.