The System module in Drupal 6.x before 6.38 and 7.x before 7.43 might allow remote attackers to hijack the authentication of site administrators for requests that download and run files with arbitrary JSON-encoded content, aka a "reflected file download vulnerability."

The User module in Drupal 6.x before 6.38 and 7.x before 7.43 allows remote attackers to gain privileges by leveraging contributed or custom code that calls the user_save function with an explicit category and loads all roles into the array.