IcedTea-Web before 1.5.3 and 1.6.x before 1.6.1 does not properly determine the origin of unsigned applets, which allows remote attackers to bypass the approval process or trick users into approving applet execution via a crafted web page.
lists.fedoraproject.org/pipermail/package-announce/2015-September/167120.html
lists.fedoraproject.org/pipermail/package-announce/2015-September/167130.html
lists.opensuse.org/opensuse-security-announce/2015-09/msg00019.html
mail.openjdk.java.net/pipermail/distro-pkg-dev/2015-September/033546.html
rhn.redhat.com/errata/RHSA-2016-0778.html
www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
www.securitytracker.com/id/1033780
www.ubuntu.com/usn/USN-2817-1
bugzilla.redhat.com/show_bug.cgi?id=1233697