It indicates a potentially malicious attempt to add new registration entry in DCForum.
DCForum is a web forum software provided by DC Business Solutions. Due to an input validation error in dcboard.cgi file, an attacker can create an extra entry in the registration database and gain additional privileges on the infected system.
Any unprotected DC Scripts DCForum 6.0 or DCForum 2000 1.0 is vulnerable to the attack.
Attackers can create additional entry in the registration database and hence gain unauthorized privileges on the victim system.
Apply appropriate patches or Upgrade the system to the latest non-vulnerable version.