Cross-site request forgery (CSRF) vulnerability in core/admin/modules/users/create.php in BigTree CMS 4.0 RC2 and earlier allows remote attackers to hijack the authentication of administrators for requests that create an administrative user via an add user action to index.php.
https://www.htbridge.com/advisory/HTB23165
https://github.com/bigtreecms/BigTree-CMS/commit/4b0faa90fa8b9e1776c86db716894dcd7e6b4834
https://exchange.xforce.ibmcloud.com/vulnerabilities/86286
http://archives.neohapsis.com/archives/bugtraq/2013-08/0039.html