BleepingComputer.com: Nasty Data-Stealing Bug Haunts Internet Explorer 8

There's an unpatched vulnerability in Internet Explorer 8 that enables simple data-stealing attacks by Web-based attackers and could lead to an attacker hijacking a user's authenticated session on a third-party site. The flaw, which a researcher said may have been known since 2008, lies in the way that IE 8 handles CSS style sheets.