Last modified: 2014-04-15 06:22:15 UTC
E.g. http://www.wikimedia.it/index.php/File:IntervisteMantova2010.mp3 is restricted (log: http://www.wikimedia.it/index.php?title=Speciale:Registri&page=File%3AIntervisteMantova2010.mp3 ) but you can still download it from even as a logged out user: http://www.wikimedia.it/images/IntervisteMantova2010.mp3 This should be the problem mentioned here: http://www.mediawiki.org/wiki/Extension_talk:SimpleSecurity#Security_bug_for_files
See http://www.mediawiki.org/wiki/Manual:Image_Authorization It can't work unless you're using img_auth.php Can you reproduce it when using img_auth.php in a recent version?