Internet Explorer 7 "onunload" Event Spoofing Vulnerability
a vulnerability in Internet Explorer 7, which can be exploited by a malicious website to spoof the address bar.
The vulnerability is caused due to an error in Internet Explorer 7's handling of "onunload" events, enabling a malicious website to abort the loading of a new website. This can be exploited to spoof the address bar if e.g. the user enters a new website manually in the address bar, which is commonly exercised as best practice.
The vulnerability is confirmed on a fully patched Windows XP SP2 system running Internet Explorer 7. Other versions may also be affected.
Solution:
Close all browser windows after visiting untrusted websites.