The Web Store inline-installer implementation in the Extensions UI in Google Chrome before 49.0.2623.75 does not block installations upon deletion of an installation frame, which makes it easier for remote attackers to trick a user into believing that an installation request originated from the user's next navigation target via a crafted web site.
https://security.gentoo.org/glsa/201603-09
https://codereview.chromium.org/1554233005
https://codereview.chromium.org/1496033003
https://code.google.com/p/chromium/issues/detail?id=550047
http://www.securitytracker.com/id/1035185
http://www.securityfocus.com/bid/84008
http://www.debian.org/security/2016/dsa-3507
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00028.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00018.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00015.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00014.html
http://googlechromereleases.blogspot.com/2016/03/stable-channel-update.html