Session fixation vulnerability in Cumin before 0.1.5444, as used in Red Hat Enterprise Messaging, Realtime, and Grid (MRG) 2.0, allows remote attackers to hijack web sessions via a crafted session cookie.
https://exchange.xforce.ibmcloud.com/vulnerabilities/78776
http://www.securityfocus.com/bid/55618
http://secunia.com/advisories/50660
http://rhn.redhat.com/errata/RHSA-2012-1281.html