The remote host is vulnerable to a flaw that allows for the bypassing of authentication.
The remote host is running the YaBB SE forum management system. There is a flaw in this version of YaBB SE that allows authenticated users to escalate privileges and gain administrative access. The 'Profile.pl' and 'Register.pl' scripts fails to sanitize CRLF sequences. An attacker can use this flaw to write data into their profile which gives them elevated access.
Upgrade or patch according to vendor recommendations.