Mozilla Firefox before 26.0, Firefox ESR 24.x before 24.2, Thunderbird before 24.2, and SeaMonkey before 2.23 do not recognize a user's removal of trust from an EV X.509 certificate, which makes it easier for man-in-the-middle attackers to spoof SSL servers in opportunistic circumstances via a valid certificate that is unacceptable to the user.
https://security.gentoo.org/glsa/201504-01
http://www.ubuntu.com/usn/USN-2053-1
http://www.ubuntu.com/usn/USN-2052-1
http://www.securitytracker.com/id/1029476
http://www.securitytracker.com/id/1029470
http://www.securityfocus.com/bid/64213
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.mozilla.org/security/announce/2013/mfsa2013-113.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00002.html
http://lists.opensuse.org/opensuse-updates/2013-12/msg00121.html
http://lists.opensuse.org/opensuse-updates/2013-12/msg00120.html
http://lists.opensuse.org/opensuse-updates/2013-12/msg00119.html
http://lists.opensuse.org/opensuse-updates/2013-12/msg00087.html
http://lists.opensuse.org/opensuse-updates/2013-12/msg00086.html
http://lists.opensuse.org/opensuse-updates/2013-12/msg00085.html
http://lists.opensuse.org/opensuse-security-announce/2013-12/msg00010.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-January/125470.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124257.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124108.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-December/123437.html