core/dom/Document.cpp in Blink, as used in Google Chrome before 43.0.2357.65, enables the inheritance of the designMode attribute, which allows remote attackers to bypass the Same Origin Policy by leveraging the availability of editing.
googlechromereleases.blogspot.com/2015/05/stable-channel-update_19.html
lists.opensuse.org/opensuse-updates/2015-05/msg00091.html
lists.opensuse.org/opensuse-updates/2015-11/msg00015.html
www.debian.org/security/2015/dsa-3267
www.securityfocus.com/bid/74723
www.securitytracker.com/id/1032375
code.google.com/p/chromium/issues/detail?id=444927
security.gentoo.org/glsa/201506-04
src.chromium.org/viewvc/blink?revision=192658&view=revision