---
id: CVE-2026-109234
title: >-
  Meow Lightbox <= 5.6.4 - Unauthenticated Stored Cross-Site Scripting via HTML
  Parser Quote-Metadata Desynchronization
summary: >-
  The Meow Lightbox plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting via the 'post_content (bbPress reply body)' parameter in all
  versions up to, and including, 5.6.4 due to insufficient input sanitization
  and output escap…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: tigroumeow
product: Meow Lightbox
affected:
  - meow_lightbox <= 5.6.4
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-01T17:35:03.254607Z'
published: '2026-10-31'
updated: '2026-11-01'
sourceUpdated: '2026-11-01T17:44:30.757Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109234'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/45fcd17e-10d5-4357-84cc-2527b07b584e?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/meow-lightbox/tags/5.6.2/vendor/kub-at/php-simple-html-dom-parser/src/KubAT/PhpSimple/lib/simple_html_dom.php#L490
  - url: >-
      https://plugins.trac.wordpress.org/browser/meow-lightbox/tags/5.6.2/vendor/kub-at/php-simple-html-dom-parser/src/KubAT/PhpSimple/lib/simple_html_dom.php#L2043
  - url: >-
      https://plugins.trac.wordpress.org/browser/meow-lightbox/tags/5.6.2/classes/core.php#L1115
  - url: >-
      https://plugins.trac.wordpress.org/browser/meow-lightbox/tags/5.6.2/classes/core.php#L1142
  - url: >-
      https://plugins.trac.wordpress.org/browser/meow-lightbox/tags/5.6.2/classes/core.php#L1276
  - url: >-
      https://plugins.trac.wordpress.org/browser/meow-lightbox/tags/5.6.2/classes/core.php#L901
  - url: >-
      https://plugins.trac.wordpress.org/changeset?old_path=/meow-lightbox/tags/5.6.4&new_path=/meow-lightbox/tags/5.6.5
tags:
  - cve.org
epss: 0.00383
epssPercentile: 0.3257
ingestedAt: '2026-11-05T19:30:42.606Z'
---

## Overview

The Meow Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'post_content (bbPress reply body)' parameter in all versions up to, and including, 5.6.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the administrator to have enabled Output Buffering, the HtmlDomParser engine, and Aggressive Resolve, as well as a stored-HTML submission surface (such as bbPress anonymous replies) whose kses allow-list preserves img attributes; given these preconditions, a one-shot unauthenticated submission can execute arbitrary JavaScript in the context of any user who views the affected page.

## Affected

- `meow_lightbox <= 5.6.4`

## Remediation

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