The OpenID idp software "Barnraiser Prairie"
http://www.barnraiser.org/prairie/ is vulnerable to directory traversal attacks:
./get_file.php does not limit the given path and allows directory traversal attacks with full public access to all images on the server.
Example exploit:
get_file.php?avatar=…&width=…/…/…/…/…/…/…/…/usr/share/apache2/icons/apache_pb.png