The autocomplete callback in Autocomplete Widgets for Text and Number Fields (autocomplete_widgets) module 6.x-1.x before 6.x-1.4 and 7.x-1.x before 7.x-1.0-rc1 does not properly handle node permissions, which allows remote authenticated users to obtain sensitive field values via unspecified vectors.
https://drupal.org/node/1972976
https://drupal.org/node/1971856
https://drupal.org/node/1971848