This indicates an attack attempt to exploit a Cross-Site Request Forgery Vulnerability in MACCMS.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. An attacker may exploit this to add an User on to the server in the context of an authorized user's session.
MACCMS Version 10
Privilege Escalation: Remote attackers can leverage their privileges on vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.