The Organic Groups (OG) module 5.x before 5.x-7.3 and 6.x before 6.x-1.0-RC1, a module for Drupal, allows remote attackers to obtain sensitive information (private group names) via unspecified vectors.
https://exchange.xforce.ibmcloud.com/vulnerabilities/43578
http://www.securityfocus.com/bid/30070