DokuWiki 2014-05-05a and earlier, when using Active Directory for LDAP authentication, allows remote attackers to bypass authentication via a user name and password starting with a null (\0) character, which triggers an anonymous bind.
http://advisories.mageia.org/MGASA-2014-0438.html
http://secunia.com/advisories/61983
https://github.com/splitbrain/dokuwiki/pull/868
http://www.debian.org/security/2014/dsa-3059