The XSS Filter in Microsoft Internet Explorer 8 does not properly perform neutering for the SCRIPT tag, which allows remote attackers to conduct cross-site scripting (XSS) attacks against web sites that have no inherent XSS vulnerabilities, a different issue than CVE-2009-4074.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12638