The Webform module 5.x before 5.x-2.8 and 6.x before 6.x-2.8, a module for Drupal, does not prevent caching of a page that contains token placeholders for a default value, which allows remote attackers to read session variables via unspecified vectors.
https://exchange.xforce.ibmcloud.com/vulnerabilities/53797
http://www.vupen.com/english/advisories/2009/2923
http://www.securityfocus.com/bid/36708