Google Chrome before 6.0.472.59 does not prompt the user before granting access to the extension history, which allows attackers to obtain potentially sensitive information via unspecified vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7371
http://googlechromereleases.blogspot.com/2010/09/stable-beta-channel-updates_14.html