Microsoft Internet Explorer 6 and 7 does not properly restrict script access to content from a (1) different domain or (2) different zone, which allows remote attackers to obtain sensitive information via a crafted web site, aka "Javascript Information Disclosure Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12385
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-018
http://www.us-cert.gov/cas/techalerts/TA11-102A.html