Mozilla Firefox 3.0.13 and earlier 3.5 3.6 a1 pre and 3.7 a1 pre does not properly block data: URIs in Location headers in HTTP responses which allows remote attackers to conduct cross-site scripting (XSS) attacks via vectors related to (1) injecting a Location header that contains JavaScript sequences in a data:text/html URI or (2) entering a data:text/html URI with JavaScript sequences when specifying the content of a Location header. NOTE: the JavaScript executes outside of the context of the HTTP site.