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WordPress plugin

Meta Box AIO <= 3.11.0 And Standalone Plugin Extensions — Unauthenticated Privilege Escalation to Administrator to 'rwmb_frontend_field_object_id' Parameter

CVE-2026-13355Published · Updated

Action summary

Meta Box User Profile: Affected: ≤2.5.16Update to 2.6.0 or newer

Meta Box AIO: Affected: ≤3.11.0Update to 3.12.0 or newer

Meta Box Frontend Submission: Affected: ≤4.6.0Update to 4.6.1 or newer

All remediation steps
Watch plugin
Severity
Critical9.8
CVSS
9.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-269 Privilege Escalation
Required access
No account needed
Exploit prediction (EPSS)
0.6% chance in 30 days49th percentile
CISA KEV
Not listed
On this page8

Am I affected?

Meta Box User Profile mb-user-profile

  1. Affected≤ 2.5.16
  2. Patched in2.6.0

Update to 2.6.0 or newer.

You are affected if you run ≤ 2.5.16. Version 2.6.0 and later are not affected by this issue.

Meta Box AIO meta-box-aio

  1. Affected≤ 3.11.0
  2. Patched in3.12.0

Update to 3.12.0 or newer.

You are affected if you run ≤ 3.11.0. Version 3.12.0 and later are not affected by this issue.

Meta Box Frontend Submission mb-frontend-submission

  1. Affected≤ 4.6.0
  2. Patched in4.6.1

Update to 4.6.1 or newer.

You are affected if you run ≤ 4.6.0. Version 4.6.1 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Meta Box User Profile.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 2.6.0, or a newer patched version
  2. Update to version 3.12.0, or a newer patched version
  3. Update to version 4.6.1, or a newer patched version
  4. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  5. Watch Meta Box User Profile to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to h0xilo.

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 4.6.0) and Meta Box User Profile (versions up to 2.5.16) are also affected.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

Same weakness (Privilege Escalation)

All Privilege Escalation
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CVE-2026-120688
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Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
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CVE-2026-121518

Timeline

  1. CVE published

    Severity critical, CVSS 9.8

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
EPSS
Exploit Prediction Scoring System by FIRST.org.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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