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CVE-2026-14488 – Unauthenticated Arbitrary Post/Page Deletion (Missing Authorization) – Meta Box AIO

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Summary

CVE-2026-14488 is a critical missing authorization (CWE-862) vulnerability in the Meta Box AIO WordPress plugin, affecting its MB Frontend Submission extension. The flaw allows unauthenticated, remote attackers to delete arbitrary posts and pages on affected sites, resulting in a high impact to data integrity and availability. It carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: The handle_request() function processing the mbfs_delete action in the MB Frontend Submission extension does not perform capability or ownership verification before deleting content (CWE-862, Missing Authorization).
  • Trigger conditions: An attacker invokes the mbfs_delete action and supplies a target object identifier via the rwmb_frontend_field_object_id GET parameter. Because the request is routed through template_redirect rather than an AJAX endpoint, the plugin’s nonce verification is ineffective and does not block the request.
  • Attack vector: Network (NETWORK) — the request can be sent remotely with no authentication or user interaction.
  • Impact: Unauthenticated deletion of arbitrary posts and pages, allowing destruction of site content (high integrity and availability impact; no confidentiality impact).

Affected software

  • Meta Box AIO — all versions up to and including 3.8.0.

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade Meta Box AIO to version 3.9.0 (released 2026-07-17) or later, which fixes the missing authorization check on frontend post deletion.
  • If no patch can be applied immediately: Restrict or disable the MB Frontend Submission extension, and block or filter unauthenticated requests carrying the mbfs_delete action and the rwmb_frontend_field_object_id parameter at the WAF or web-server layer until the update is deployed.

References

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