Blink, as used in Google Chrome before 44.0.2403.89, enables a quirks-mode exception that limits the cases in which a Cascading Style Sheets (CSS) document is required to have the text/css content type, which allows remote attackers to bypass the Same Origin Policy via a crafted web site, related to core/fetch/CSSStyleSheetResource.cpp.
googlechromereleases.blogspot.com/2015/07/stable-channel-update_21.html
lists.opensuse.org/opensuse-security-announce/2015-07/msg00038.html
rhn.redhat.com/errata/RHSA-2015-1499.html
www.debian.org/security/2015/dsa-3315
www.securityfocus.com/bid/75973
www.securitytracker.com/id/1033031
code.google.com/p/chromium/issues/detail?id=419383
security.gentoo.org/glsa/201603-09
src.chromium.org/viewvc/blink?revision=195266&view=revision