Microsoft Internet Explorer 5.01 and 6 does not properly identify the originating domain zone when handling redirects, which allows remote attackers to read cross-domain web pages and possibly execute code via unspecified vectors involving a crafted web page, aka "Source Element Cross-Domain Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A577
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-042
http://www.vupen.com/english/advisories/2006/3212
http://www.us-cert.gov/cas/techalerts/TA06-220A.html
http://www.securityfocus.com/bid/19400
http://www.kb.cert.org/vuls/id/252764