Direct static code injection vulnerability in chat/login.php in Ultimate PHP Board (UPB) 2.0b1 and earlier allows remote attackers to inject arbitrary PHP code via the username parameter, which is injected into chat/text.php.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-6773
http://www.vupen.com/english/advisories/2006/5181
http://www.securityfocus.com/data/vulnerabilities/exploits/21760.pl