Feature Pack for Communications Enabled Applications (CEA) before 1.0.0.1 for IBM WebSphere Application Server 7.0.0.7 uses predictable session values, which allows man-in-the-middle attackers to spoof a collaboration session by guessing the value.
https://exchange.xforce.ibmcloud.com/vulnerabilities/54494
http://www.vupen.com/english/advisories/2009/3598
http://www.securityfocus.com/bid/37392