The Meta Box AIO plugin for WordPress is vulnerable to Missing Authorization via the template_redirect dispatcher in the MB Frontend Submission extension in versions up to, and including, 3.8.0. This is due to the handle_request() function routing the mbfs_delete action without any capability or ownership check, and the nonce verification in check_ajax() being gated behind is_ajax() which is false for template_redirect requests, making it bypassable. This makes it possible for unauthenticated attackers to delete arbitrary posts and pages by supplying an attacker-controlled post ID via the rwmb_frontend_field_object_id GET parameter on any page that hosts a frontend submission form regardless of whether allow_delete is enabled.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Meta Box Aio Plugin | — | Update meta-box-aio plugin to version 3.9.0, or a newer patched version | Jul 29, 2026 | Jul 28, 2026 |
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