The Gallery Metabox for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the gallery_remove function in versions up to, and including, 1.5. This makes it possible for subscriber-level attackers to modify galleries attached to posts and pages with this plugin.
https://plugins.trac.wordpress.org/browser/gallery-metabox/trunk/gallery-metabox.php?rev=611664#L233