---
id: CVE-2026-14855
title: >-
  The RT Mega Menu plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting via the 'css[left]' parameter in all versions up to, and including,
  1.5.1 due to insufficient input sanitization and output escaping
summary: >-
  The RT Mega Menu plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting via the 'css[left]' parameter in all versions up to, and including,
  1.5.1 due to insufficient input sanitization and output escaping. This makes
  it possib…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: themewant
product: RT Mega Menu – Mega Menu Builder for Elementor & Gutenberg
affected:
  - rt_mega_menu_mega_menu_builder_for_elementor_gutenberg <= 1.5.1
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T15:17:05.243'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-14855'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/rt-mega-menu/tags/1.5.1/admin/includes/admin-ajax-request.php#L34
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rt-mega-menu/tags/1.5.1/admin/includes/admin-ajax-request.php#L68
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rt-mega-menu/tags/1.5.1/admin/includes/plugin-scripts.php#L81
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rt-mega-menu/tags/1.5.1/public/includes/rt-mega-menu-terms.php#L82
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rt-mega-menu/tags/1.5.1/public/includes/rtmega-nav-walker.php#L186
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/4302ab90-f827-4e25-b72f-d41542d3bad3?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T14:18:33.473200Z'
epss: 0.00201
epssPercentile: 0.088
ingestedAt: '2026-09-18T02:34:02.990Z'
---

## Overview

The RT Mega Menu plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'css[left]' parameter in all versions up to, and including, 1.5.1 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.

## Remediation

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