The Isolated Sites feature in Google Chrome before 26.0.1410.43 does not properly enforce the use of separate processes, which makes it easier for remote attackers to bypass intended access restrictions via a crafted web site.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16670
https://code.google.com/p/chromium/issues/detail?id=174943
http://googlechromereleases.blogspot.com/2013/03/stable-channel-update_26.html