CVE-2026-13355

9.8 CRITICAL

Published 2026-09-22 · Updated 2026-09-22

AI risk analysis

Summary: The flaw allows unauthenticated attackers to escalate privileges to Administrator by manipulating shortcode attributes and updating post_content.
Exploitability: Exploitation is relatively straightforward with preconditions of having access to wp_update_post() and injecting specific shortcodes.
Blast radius: If exploited, the impact could be severe as it grants full administrative control over the WordPress site.
Prioritized remediation: Update all affected Meta Box plugins to their latest versions immediately.

auth-bypasspriv-escalationwp-pluginadmin-access

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-269

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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