Mozilla Firefox before 48.0 allows remote attackers to spoof the location bar via crafted characters in the media type of a data: URL.
https://security.gentoo.org/glsa/201701-15
https://bugzilla.mozilla.org/show_bug.cgi?id=1255570
http://www.ubuntu.com/usn/USN-3044-1
http://www.securitytracker.com/id/1036508
http://www.securityfocus.com/bid/92260
http://www.mozilla.org/security/announce/2016/mfsa2016-66.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00029.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00004.html