TransWARE Active! mail 2003 build 2003.0139.0871 and earlier does not properly secure the session ID in a session cookie, which allows remote attackers to hijack web sessions, probably related to the "secure" flag for cookies in SSL sessions.
https://exchange.xforce.ibmcloud.com/vulnerabilities/54752
http://www.transware.co.jp/support_am/security/vulnerability1.html