SQL injection vulnerability in login.php in TheWebForum (twf) 1.2.1 allows remote attackers to execute arbitrary SQL commands and bypass login authentication via the username parameter (aka the u variable).
https://exchange.xforce.ibmcloud.com/vulnerabilities/24027
http://www.vupen.com/english/advisories/2006/0093
http://www.securityfocus.com/archive/1/421039/100/0/threaded