Microsoft Internet Explorer 5.01 SP4, 6, 6 SP1, and 7 does not properly handle unspecified "encoding strings," which allows remote attackers to bypass the Same Origin Policy and obtain sensitive information via a crafted web site, aka "Post Encoding Information Disclosure Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7840
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-018
http://www.vupen.com/english/advisories/2010/0744
http://www.us-cert.gov/cas/techalerts/TA10-089A.html
http://www.us-cert.gov/cas/techalerts/TA10-068A.html
http://www.securityfocus.com/bid/39028
http://securitytracker.com/id?1023773