The Commons Group module before 7.x-3.1 for Drupal, as used in the Commons module before 7.x-3.1, does not properly restrict access to groups, which allows remote attackers to post arbitrary content to groups via unspecified vectors.
osvdb.org/91748
packetstormsecurity.com/files/120991/Drupal-Common-Groups-7.x-Access-Bypass-Privilege-Escalation.html
seclists.org/fulldisclosure/2013/Mar/242
secunia.com/advisories/52769
secunia.com/advisories/52795
drupal.org/node/1954762
drupal.org/node/1954764
drupal.org/node/1954948
exchange.xforce.ibmcloud.com/vulnerabilities/83133