The Meta Box AIO WordPress plugin is vulnerable to missing authorization (CVE-2026-14488, CVSS 9.1) in versions up to 3.8.0, allowing unauthenticated attackers to delete arbitrary posts and pages via a bypassable nonce check. The flaw impacts any site with a frontend submission form regardless of delete settings.
The plugin's nonce check inside check_ajax() sits behind an is_ajax() guard that evaluates to false during template_redirect calls, allowing the verification to be bypassed.
Exploitation succeeds regardless of whether the allow_delete setting is active.
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