download.php in McGallery 0.5b allows remote attackers to read arbitrary files and obtain script source code via the filename parameter.
Directory traversal vulnerability in admin.php in McGallery 1.1 allows remote attackers to read arbitrary files via a .. (dot dot) in the lang parameter.
show.php in McGallery 1.1 allows remote attackers to connect to arbitrary databases, or gain sensitive information by triggering an error, via a modified host parameter.