Microsoft issued an out of band notification for its Internet Explorer products. This is a notification for a critical vulnerability which would allow remote code execution. IE versions 5 to 8 beta 2 are affected. It is suggested to apply the update for this vulnerability as soon as it is released. Meanwhile, browse the web through a different browser or visit as few pages as possible.

The details are available here:

http://www.microsoft.com/technet/security/Bulletin...c.mspx