Format string vulnerability in Apple iPhoto before 7.1.2 allows remote attackers to execute arbitrary code via photocast subscriptions.
http://www.vupen.com/english/advisories/2008/0428/references
http://www.securitytracker.com/id?1019307
http://www.securityfocus.com/bid/27636
http://secunia.com/advisories/28805
http://lists.apple.com/archives/security-announce/2008/Feb/msg00000.html