The NavigatorServiceWorker::serviceWorker function in modules/serviceworkers/NavigatorServiceWorker.cpp in Blink, as used in Google Chrome before 45.0.2454.85, allows remote attackers to bypass the Same Origin Policy by accessing a Service Worker.
https://src.chromium.org/viewvc/blink?revision=201055&view=revision
https://security.gentoo.org/glsa/201603-09
https://codereview.chromium.org/1307883002/
https://code.google.com/p/chromium/issues/detail?id=522791
http://www.securitytracker.com/id/1033472
http://www.debian.org/security/2015/dsa-3351
http://rhn.redhat.com/errata/RHSA-2015-1712.html
http://lists.opensuse.org/opensuse-updates/2015-11/msg00013.html
http://lists.opensuse.org/opensuse-updates/2015-09/msg00029.html
http://googlechromereleases.blogspot.com/2015/09/stable-channel-update.html