Session fixation vulnerability in Drupal 5.x before 5.9 and 6.x before 6.3, when contributed modules "terminate the current request during a login event," allows remote attackers to hijack web sessions via unknown vectors.
https://www.redhat.com/archives/fedora-package-announce/2008-July/msg00551.html
https://www.redhat.com/archives/fedora-package-announce/2008-July/msg00527.html
https://www.redhat.com/archives/fedora-package-announce/2008-August/msg00016.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/43706
https://bugzilla.redhat.com/show_bug.cgi?id=454849
http://www.securityfocus.com/bid/30359
http://www.securityfocus.com/bid/30168
http://www.openwall.com/lists/oss-security/2008/07/10/3
http://secunia.com/advisories/31211