code/sitefeatures/PageCommentInterface.php in SilverStripe 2.4.x before 2.4.6 might allow remote attackers to execute arbitrary code via a crafted cookie in a user comment submission, which is not properly handled when it is deserialized.
http://www.openwall.com/lists/oss-security/2012/04/30/3
http://www.openwall.com/lists/oss-security/2012/04/30/1
http://doc.silverstripe.org/framework/en/trunk/changelogs/2.4.6