The Ibtana – Ecommerce Product Addons plugin for WordPress is vulnerable to unauthorized post meta modification due to a missing capability check on the 'iepausegteditor' AJAX action in all versions up to, and including, 0.4.7.7. This makes it possible for authenticated attackers, with Subscriber-level access and above, to update or delete arbitrary post meta entries via the 'iepabuilder' meta key.