The XSS Filter in Microsoft Internet Explorer 8 allows remote attackers to leverage the "response-changing mechanism" to conduct cross-site scripting (XSS) attacks against web sites that have no inherent XSS vulnerabilities, related to the details of output encoding and improper modification of an HTML attribute, aka "XSS Filter Script Handling Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7715
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-002
http://www.theregister.co.uk/2009/11/20/internet_explorer_security_flaw/
http://www.securityfocus.com/bid/37135
http://www.owasp.org/images/5/50/OWASP-Italy_Day_IV_Maone.pdf
http://hackademix.net/2009/11/21/ies-xss-filter-creates-xss-vulnerabilities/