Multiple SQL injection vulnerabilities in Ugroup 2.6.2 and earlier allow remote attackers to execute arbitrary SQL commands via the (1) FORUM_ID parameter in forum.php, and the (2) TOPIC_ID, (3) FORUM_ID, and (4) CAT_ID parameters in topic.php.
http://www.vupen.com/english/advisories/2005/2619
http://secunia.com/advisories/17734
http://pridels0.blogspot.com/2005/11/ugroup-262-sql-inj-vuln.html