DokuWiki before 2006-03-09c enables the debug feature by default, which allows remote attackers to obtain sensitive information by calling doku.php with the X-DOKUWIKI-DO HTTP header set to "debug".
https://exchange.xforce.ibmcloud.com/vulnerabilities/28819
http://www.securityfocus.com/archive/1/445516/100/0/threaded
http://securityreason.com/securityalert/1537