The Site Documentation Drupal module 5.x before 5.x-1.8 and 6.x before 6.x-1.1 allows remote authenticated users to gain privileges of other users by leveraging the "access content" permission to list tables and obtain session IDs from the database.
https://exchange.xforce.ibmcloud.com/vulnerabilities/42453
http://www.vupen.com/english/advisories/2008/1541/references
http://www.securityfocus.com/bid/29242