Microsoft Security Advisory 2416728 (Vulnerability in ASP.NET) and SharePoint.

Microsoft recently released a Microsoft Security Advisory about a security vulnerability in ASP.NET.

This post explains the impact on SharePoint and documents a recommended workaround.
This vulnerability affects Microsoft SharePoint 2010 and Microsoft SharePoint Foundation 2010.  The vulnerability is in ASP.NET.

Microsoft recommends that all SharePoint 2010 customers apply the workaround as soon as possible.  This post will be updated with any new information.

The workaround for SharePoint 2010 is slightly different from the one documented in the advisory.
For SharePoint 2010, you should follow the instructions here on every web front-end in your SharePoint farm