base_maintenance.php in Basic Analysis and Security Engine (BASE) before 1.2.4 (melissa), when running in standalone mode, allows remote attackers to bypass authentication, possibly by setting the standalone parameter to "yes".
http://www.vupen.com/english/advisories/2006/1192
http://www.securityfocus.com/bid/17354
http://secunia.com/advisories/19510
http://cvs.sourceforge.net/viewcvs.py/secureideas/base-php4/docs/CHANGELOG?rev=1.233&view=markup