The extension functionality in Google Chrome before 26.0.1410.43 does not verify that use of the permissions API is consistent with file permissions, which has unspecified impact and attack vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16674
https://code.google.com/p/chromium/issues/detail?id=169632
http://googlechromereleases.blogspot.com/2013/03/stable-channel-update_26.html