Microsoft Silverlight Elevation of Privilege Vulnerability

An elevation of privilege vulnerability exists in Microsoft Silverlight that is caused when Silverlight improperly allows applications that are intended to run at a low integrity level (very limited permissions) to be executed at a medium integrity level (permissions of the current user) or higher. To exploit this vulnerability an attacker would first have to log on to the system or convince a logged on user to execute a specially crafted Silverlight application.