tiki-view_forum_thread.php in TikiWiki 1.9.0 through 1.9.2 allows remote attackers to obtain the installation path via an invalid topics_sort_mode parameter, possibly related to an SQL injection vulnerability.
http://www.vupen.com/english/advisories/2005/2376
http://www.securityfocus.com/archive/1/416152/30/0/threaded