User.php in Gallery, as used in Postnuke, allows users with any Admin privileges to gain access to all galleries.
http://www.securityfocus.com/bid/14547
http://www.debian.org/security/2005/dsa-879
http://secunia.com/advisories/17367
http://secunia.com/advisories/16389
http://gallery.menalto.com/index.php?name=PNphpBB2&file=viewtopic&t=7048