Web Based Administration in MicroWorld Technologies MailScan 5.6.a espatch 1 allows remote attackers to bypass authentication and obtain administrative access via a direct request with (1) an IsAdmin=true cookie value or (2) no cookie.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44515
https://euvd.enisa.europa.eu/vulnerability/EUVD-2008-3715
http://www.securityfocus.com/bid/30700
http://www.oliverkarow.de/research/mailscan.txt