A typo in the administrator permission check in the ACL Manager plugin (plugins/acl/ajax.php) in DokuWiki before 2009-12-25b allows remote attackers to gain privileges and access closed wikis by editing current ACL statements, as demonstrated in the wild in January 2010.
https://exchange.xforce.ibmcloud.com/vulnerabilities/55661
http://www.vupen.com/english/advisories/2010/0150
http://www.splitbrain.org/blog/2010-01/17-dokuwiki-security
http://www.securityfocus.com/bid/37820
http://www.exploit-db.com/exploits/11141
http://www.debian.org/security/2010/dsa-1976
http://security.gentoo.org/glsa/glsa-201301-07.xml
http://secunia.com/advisories/38183
http://lists.fedoraproject.org/pipermail/package-announce/2010-February/034831.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-February/034729.html
http://bugs.splitbrain.org/index.php?do=details&task_id=1847