Directory traversal vulnerability in pm.php in Phorum 5 allows remote authenticated users to include and execute arbitrary local files via directory traversal sequences in the GLOBALS[template] parameter, as demonstrated by injecting PHP sequences into a log file, which is then included by pm.php.
http://www.vupen.com/english/advisories/2006/2794
http://www.securityfocus.com/archive/1/439976/100/0/threaded