Reported vulnerability
Meta Box AIO <= 3.11.0 And Standalone Plugin Extensions - Unauthenticated Privilege Escalation to Administrator to 'rwmb_frontend_field_object_id' Parameter
Published 21 Sept 2026
Updated 8 Oct 2026
CVE-2026-13355
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Wordfence advisory
critical · CVSS 9.8The 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 4.6.0) and Meta Box User Profile (versions up to 2.5.16) are also affected.
Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Meta Box User Profile
- Software
- plugin · mb-user-profile
- Affected versions
- Start version unspecified, through 2.5.16
- Fix availability
- Fix available
- Fixed versions
- 2.6.0
Recommended action
Update to version 2.6.0, or a newer patched version
Meta Box AIO
- Software
- plugin · meta-box-aio
- Affected versions
- Start version unspecified, through 3.11.0
- Fix availability
- Fix available
- Fixed versions
- 3.12.0
Recommended action
Update to version 3.12.0, or a newer patched version
Meta Box Frontend Submission
- Software
- plugin · mb-frontend-submission
- Affected versions
- Start version unspecified, through 4.6.0
- Fix availability
- Fix available
- Fixed versions
- 4.6.1
Recommended action
Update to version 4.6.1, or a newer patched version
Further references (1)
Data sources and licences
Copyright 2012-2026 Defiant Inc.
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Read licence termsCopyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
Read licence termsSource: Wordfence
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Other reports for the same product
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