CVE-2026-13355

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.

Overview

State: PUBLISHED
Assigner (CNA): Wordfence
CVSS severity: CRITICAL
CVSS score: 9.8 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Effective score: 9.8 / 10 CRITICAL source: CNA overview
CWE(s): CWE-269
Reserved: 2026-06-25
Published: 2026-09-22 04:27 UTC
Last updated: 2026-09-22 10:25 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/13xxx/CVE-2026-13355.json
Linked Threat: CVE-2026-13355 — Meta Box AIO <= 3.7.2 And Standalone Plugin Extensions - Unauthenticated Privilege Escalation to Administrator to 'rwmb_frontend_field_object_id' Parameter

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 05:16:54 UTC
NVD last modified: 2026-09-22 19:04:55 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: security@wordfence.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0034 (probability of exploitation in next 30 days)
EPSS percentile: 28.10% vs all CVEs — higher = more likely to be exploited, as of 2026-09-22

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84268
Assigner: Wordfence
Published: Sep 22, 2026, 4:27:37 AM
Updated: Sep 22, 2026, 10:25:33 AM
EUVD base score (CVSS 3.1): 9.8 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 0.3500
Vendors: Meta Box
Products: Meta Box Frontend Submission (0 ≤4.5.6)
Aliases: GHSA-q84q-9hmp-p3qm

ENISA 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.

EUVD references (3)

Affected products (1)

Vendor	Product	Versions	Platforms
Meta Box	Meta Box Frontend Submission	`0` (affected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://metabox.io/changelog/ security@wordfence.com
https://metabox.io/plugins/meta-box-aio/changelog/ security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/3b7b6e7e-b944-45f8-a6d8-bfd859bec0d1?source=cve security@wordfence.com

Indicators (1)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cve	`CVE-2026-13355`	no local data	2026-09-21 20:38 UTC

Remediations (3)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Wordfence remediation: Meta Box User Profile

Wordfence

Update to version 3.12.0, or a newer patched version

2026-09-21 20:38 UTC
Wordfence remediation: Meta Box AIO

Wordfence

Update to version 3.12.0, or a newer patched version

2026-09-21 20:38 UTC
Wordfence remediation: Meta Box Frontend Submission

Wordfence

Update to version 4.6.0, or a newer patched version

2026-09-21 20:38 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-13355.json.

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                  }
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