The TreeScope::adoptIfNeeded function in WebKit/Source/core/dom/TreeScope.cpp in the DOM implementation in Blink, as used in Google Chrome before 50.0.2661.102, does not prevent script execution during node-adoption operations, which allows remote attackers to bypass the Same Origin Policy via a crafted web site.
https://security.gentoo.org/glsa/201605-02
https://codereview.chromium.org/1953323002/
http://www.ubuntu.com/usn/USN-2960-1
http://www.securitytracker.com/id/1035872
http://www.securityfocus.com/bid/90584
http://www.debian.org/security/2016/dsa-3590
http://rhn.redhat.com/errata/RHSA-2016-1080.html
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00048.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00050.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00043.html
http://googlechromereleases.blogspot.com/2016/05/stable-channel-update.html