Microsoft Internet Explorer 8 does not properly handle content settings in HTTP responses, which allows remote web servers to obtain sensitive information from a different (1) domain or (2) zone via a crafted response, aka "MIME Sniffing Information Disclosure Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12464
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-050