Session fixation vulnerability in BLUEPAGE CMS 2.5 and earlier allows remote attackers to hijack web sessions by setting the PHPSESSID parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/45323
https://euvd.enisa.europa.eu/vulnerability/EUVD-2008-6009
http://www.securityfocus.com/bid/31315
http://www.securityfocus.com/archive/1/496582/100/0/threaded
http://www.majorsecurity.de/index_2.php?major_rls=major_rls53