Microsoft Internet Explorer 6 through 9 does not properly perform copy-and-paste operations, which allows user-assisted remote attackers to read content from a different (1) domain or (2) zone via a crafted web site, aka "Copy and Paste Information Disclosure Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14835
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-010