Direct static code injection vulnerability in doku.php in DokuWiki before 2006-030-09c allows remote attackers to execute arbitrary PHP code via the X-FORWARDED-FOR HTTP header, which is stored in config.php.
http://www.securityfocus.com/archive/1/445516/100/0/threaded
http://securityreason.com/securityalert/1537
http://security.gentoo.org/glsa/glsa-200609-10.xml
http://secunia.com/advisories/21936