MS13-052: Description of the security update for the .NET Framework 4.5 on Windows 8, Windows RT, and Windows Server 2012: July 9, 2013

August 13, 2013 This security update has been re-released and contains updated files. We recommend that you apply this updated security update.


This update resolves a vulnerability in the Microsoft .NET Framework that could allow elevation of privilege on a client system if a user views a specially crafted webpage by using a web browser that can run XAML Browser Applications (XBAPs).


Microsoft has released the security bulletin MS13-052. You can view the complete security bulletin by going to one of the following Microsoft websites:

How to obtain help and support for this security update

Help installing updates: Support for Microsoft Update

Security solutions for IT professionals: TechNet Security Troubleshooting and Support

Help protect your computer that is running Windows from viruses and malware: Virus Solution and Security Center

Local support according to your country: International Support

More Information

Download information

This update is available for download from the Microsoft Download Center:

Known issues with this security update

  • Windows Update will not offer this security update to Windows RT-based computers until update 2808380 is installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
    2808380 Windows RT-based device cannot download software updates or Windows Store apps

Command-line switches for this update

For information about the various command-line switches that are supported by this update, click the following article number to view the article in the Microsoft Knowledge Base:

2844699 Command-line switches for Microsoft .NET Framework security update packages

Restart information

This update does not require a system restart after you apply the update unless the files that are being updated are locked or are being used.

Update replacement information

This update does not replace any previously released update.

Update removal information

Note We do not recommend that you remove any security update.

To remove this update, use the Programs and Features item in Control Panel.

Applies to

This article applies to the following:
  • Microsoft .NET Framework 4.5 when used with:
    • Windows 8
    • Windows RT
    • Windows Server 2012