Microsoft Internet Explorer 6 through 8 does not properly handle unspecified special characters in Cascading Style Sheets (CSS) documents, which allows remote attackers to obtain sensitive information from a different (1) domain or (2) zone via a crafted web site, aka "CSS Special Character Information Disclosure Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7410
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-071