Unspecified vulnerability in phpBB before 3.0.4 allows attackers to bypass intended access restrictions and activate de-activated accounts via unknown vectors.
https://exchange.xforce.ibmcloud.com/vulnerabilities/47370
http://www.securityfocus.com/bid/32842
http://www.phpbb.com/support/documents.php?mode=changelog&version=3#v303
http://www.phpbb.com/community/viewtopic.php?f=14&t=1352565