Absolute path traversal vulnerability in include.php in PHPKIT 1.6.1 Release 2 and earlier allows remote attackers to include and execute arbitrary local files via a direct request with a path parameter with a null character and beginning with (1) '/' (slash) for an absolute pathname or (2) a drive letter (such as "C:"), which bypasses checks for ".." sequences and trailing ".php" extensions.
http://www.securityfocus.com/archive/1/425196/100/0/threaded