Describe CVE-2011-1587.
What is CVE-2011-1587?
Cross-site scripting (XSS) vulnerability in MediaWiki before 1.16.4, when Internet Explorer 6 or earlier is used, allows remote attackers to inject arbitrary web script or HTML via an uploaded file accessed with a dangerous extension such as .html located before a ? (question mark) in a query string, in conjunction with a modified URI path that has a %2E sequence in place of the . (dot) character.  NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-1578..