The focus handling for the onkeydown event in Microsoft Internet Explorer 6.0 allows remote attackers to change field focus and copy keystrokes via a certain use of a JavaScript htmlFor attribute, as demonstrated by changing focus from a textarea to a file upload field, a related issue to CVE-2007-3511.
https://exchange.xforce.ibmcloud.com/vulnerabilities/36848
http://www.securityfocus.com/bid/25836