Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird before 17.0.8, Thunderbird ESR 17.x before 17.0.8, and SeaMonkey before 2.20 do not properly restrict local-filesystem access by Java applets, which allows user-assisted remote attackers to read arbitrary files by leveraging a download to a fixed pathname or other predictable pathname.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18367
https://bugzilla.mozilla.org/show_bug.cgi?id=406541
http://www.securityfocus.com/bid/61896
http://www.mozilla.org/security/announce/2013/mfsa2013-75.html