SQL injection vulnerability in search.php in Phorum 5.0.0alpha through 5.0.20, when register_globals is enabled, allows remote attackers to execute arbitrary SQL commands via the forum_ids parameter.
http://www.vupen.com/english/advisories/2005/2332
http://securityreason.com/securityalert/153
http://secunia.com/advisories/17456