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.

The Organic Groups (OG) module 7.x-1.x before 7.x-1.5 for Drupal does not properly maintain pending group memberships, which allows remote authenticated users to post to arbitrary groups by modifying their own account while a pending membership is waiting to be approved.

The Organic Groups (OG) module 7.x-2.x before 7.x-2.3 for Drupal allows remote attackers to bypass access restrictions and post to arbitrary groups via a group audience field, as demonstrated by the og_group_ref field.

The Organic Groups (OG) module 7.x-2.x before 7.x-2.3 for Drupal allows remote authenticated users to bypass group restrictions on nodes with all groups set to optional input via an empty group field.