Direct static code injection vulnerability in forum.php in Ben Ng Scribe 0.2 and earlier allows remote attackers to inject arbitrary PHP code into a certain file in regged/ via the username parameter in a Register action, possibly related to the register function in forumfunctions.php.
https://www.exploit-db.com/exploits/4596
https://exchange.xforce.ibmcloud.com/vulnerabilities/38227
http://www.vupen.com/english/advisories/2007/3746
http://www.securityfocus.com/bid/26302
http://www.securityfocus.com/archive/1/483183/100/0/threaded
http://www.inj3ct-it.org/exploit/scribe.txt