The RESTWS Basic Auth submodule in the RESTful Web Services module 7.x-1.x before 7.x-1.5 and 7.x-2.x before 7.x-2.3 for Drupal caches pages for authenticated requests, which allows remote attackers to obtain sensitive information via unspecified vectors.
https://www.drupal.org/node/2428863
https://www.drupal.org/node/2428857
https://www.drupal.org/node/2428855