source: https://www.securityfocus.com/bid/64540/info

JForum is prone to a cross-site request-forgery vulnerability because the application does not properly validate HTTP requests.

Exploiting this issue may allow a remote attacker to perform certain unauthorized actions in the context of the affected application. Other attacks are also possible. 

http://www.example.com/forum/admBase/login.page?action=groupsSave&module=adminUsers&user_id=12696&groups=2