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9.8

Meta Box Frontend Submission lets anyone become admin

CVE-2026-13355 · published 20 days ago
Summary

The Meta Box Frontend Submission plugin for WordPress (up to version 3.11.0, and related extensions up to their listed versions) lets a visitor change page content and assign themselves an administrator role. This happens because the plugin accepts a special URL parameter without checking who is making the request. Update the plugin to the newest release or apply the vendor’s security patch to stop this behavior.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
meta box meta box frontend submission <= 4.5.6
Original advisory text
Meta Box AIO <= 3.11.0 And Standalone Plugin Extensions - Unauthenticated Privilege Escalation to Administrator to 'rwmb_frontend_field_object_id' Parameter
The Meta Box AIO plugin for WordPress is vulnerable to Privilege Escalation to Administrator in versions up to, and including, 3.11.0. This is due to a chained flaw: the populate_via_query_string() function in the mb-frontend-submission component unconditionally overrides the form's target object_id from the GET parameter 'rwmb_frontend_field_object_id' without any authorization check, and Form::process() lacks the user_can_edit() check present in render(), allowing unauthenticated attackers to overwrite the post_content of any page with an arbitrary shortcode via wp_update_post(); the mb-user-profile component then directly trusts the 'role' and 'auto_login' shortcode attributes in the injected [mb_user_profile_register] shortcode with no role validation. This makes it possible for unauthenticated attackers to elevate their privileges to Administrator. The standalone plugins Meta Box Frontend Submission (in versions up to 4.5.6) and Meta Box User Profile (versions up to 3.11.0) are also affected.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-269Improper Privilege Management
Timeline
Published22 Sep 2026
Updated11 Oct 2026
First seen22 Sep 2026
Sources
CVE-2026-13355 · NVD
CVE-2026-13355 · MITRE
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