Cross-site scripting (XSS) vulnerability in Mozilla Thunderbird 17.x through 17.0.8, Thunderbird ESR 17.x through 17.0.10, and SeaMonkey before 2.20 allows user-assisted remote attackers to inject arbitrary web script or HTML via an e-mail message containing a data: URL in an IFRAME element, a related issue to CVE-2014-2018.
https://bugzilla.mozilla.org/show_bug.cgi?id=868267
http://www.ubuntu.com/usn/USN-2119-1
http://www.securitytracker.com/id/1029774
http://www.securitytracker.com/id/1029773
http://www.mozilla.org/security/announce/2014/mfsa2014-14.html