---
id: CVE-2026-109216
title: >-
  Meta Box <= 5.15.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting
  via Background Field Array Keys
summary: >-
  The Meta Box – A Framework for Dynamic Websites plugin for WordPress is
  vulnerable to Stored Cross-Site Scripting via the
  'profile_background[<attacker-chosen key>]' parameter in all versions up to,
  and including, 5.15.2 due to insuffici…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: metabox
product: Meta Box – A Framework for Dynamic Websites
affected:
  - meta_box_a_framework_for_dynamic_websites <= 5.15.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-29T12:17:36.454458Z'
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T12:36:51.108Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109216'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/7a8948f5-8bcf-48f2-b3a6-bfa24ba9bef0?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.2/inc/fields/background.php#L154
  - url: >-
      https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.2/inc/sanitizer.php#L170
  - url: 'https://github.com/wpmetabox/meta-box/pull/1709'
  - url: >-
      https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.3/inc/fields/background.php
tags:
  - cve.org
epss: 0.00228
epssPercentile: 0.1365
ingestedAt: '2026-11-01T17:57:46.238Z'
---

## Overview

The Meta Box – A Framework for Dynamic Websites plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'profile_background[<attacker-chosen key>]' parameter in all versions up to, and including, 5.15.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitability depends on a consuming plugin or theme built on Meta Box that exposes the background field to lower-privileged users and renders stored values via the rwmb_the_value()/format_single_value() pattern; the effective minimum privilege is whatever role that consumer permits, demonstrated at Subscriber level.

## Affected

- `meta_box_a_framework_for_dynamic_websites <= 5.15.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.