SQL injection vulnerability in upgradev1.php in X7 Chat 2.0.4 and earlier allows remote attackers to execute arbitrary SQL commands via the old_prefix parameter.
https://www.exploit-db.com/exploits/2068
https://exchange.xforce.ibmcloud.com/vulnerabilities/27921
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-3845