The "have you forgotten your password" links in the User module in Drupal 7.x before 7.43 and 8.x before 8.0.4 allow remote attackers to obtain sensitive username information by leveraging a configuration that permits using an email address to login and a module that permits logging in.
The Organic Groups (OG) module 6.x-2.x before 6.x-2.3 for Drupal does not properly restrict access, which allows remote attackers to obtain sensitive information such as private group titles via a request through the Views module.
Drupal 6.x before 6.37 and 7.x before 7.39 allows remote attackers to obtain sensitive node titles by reading the menu.
Drupal 6.x before 6.31 and 7.x before 7.27 does not properly isolate the cached data of different anonymous users, which allows remote anonymous users to obtain sensitive interim form input information in opportunistic situations via unspecified vectors.