There is an update starting to show up in Windows Update that fixes a security related issue with the built in Adobe Flash Player in Windows 8, 8.1, Server 2012 and 2012 R2.
This fix is not related to the newest Zero Day threat that was revealed over this past weekend which effects IE6 all the way up to IE11.
You can find out more about this fix at http://support.microsoft.com/kb/2961887.
Microsoft is announcing the availability of an update for Adobe Flash Player in Internet Explorer on all supported editions of Windows 8, Windows Server 2012, Windows RT, Windows 8.1, Windows Server 2012 R2, and Windows RT 8.1. The update addresses the vulnerabilities in Adobe Flash Player by updating the affected Adobe Flash libraries contained within Internet Explorer 10 and Internet Explorer 11.
Here are the direct download links from the Microsoft Download Center:
There is one known issue with this update according to Microsoft:
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
That knowledge base article and update is from March 2013 so it is quite likely you already have it installed on your Windows RT based device if you keep it updated.