The Extensions subsystem in Google Chrome before 48.0.2564.109 does not prevent use of the Object.defineProperty method to override intended extension behavior, which allows remote attackers to bypass the Same Origin Policy via crafted JavaScript code.
https://security.gentoo.org/glsa/201603-09
https://codereview.chromium.org/1417513003
https://code.google.com/p/chromium/issues/detail?id=546677
http://www.securitytracker.com/id/1035183
http://www.securityfocus.com/bid/83125
http://www.debian.org/security/2016/dsa-3486
http://rhn.redhat.com/errata/RHSA-2016-0241.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00119.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00104.html
http://googlechromereleases.blogspot.com/2016/02/stable-channel-update_9.html