Prevent user to see detail view of attachment of another user

This plugin prevents unprivileged users to see images, that other users uploaded:

add_filter('parse_query', 'own_content_only_restriction' );

function own_content_only_restriction( $wp_query ) {
    if ( !current_user_can( 'see_others_media' ) ) {
        if ( strpos( $_SERVER[ 'REQUEST_URI' ], '/wp-admin/upload.php' ) !== false
        || strpos( $_SERVER[ 'REQUEST_URI' ], '/wp-admin/admin-ajax.php' ) !== false 
        || strpos( $_SERVER[ 'REQUEST_URI' ], '/wp-admin/edit.php' ) !== false ) {
            global $current_user;
            $wp_query->set( 'author', $current_user->ID );
        }
    }
}

It can be bypassed though, if the user goes to the detail view of one of his images, for example /wp-admin/upload.php?item=608 and then just enters a different valid item ID. How can I change the plugin code to even prevent this?