---
id: CVE-2026-118166
title: >-
  MC4WP: Mailchimp for WordPress < 4.15.0 - Unauthenticated Arbitrary Shortcode
  Execution via Dynamic Content Tag
summary: >-
  The MC4WP: Mailchimp for WordPress WordPress plugin before 4.15.0 does not
  prevent request-derived values in its dynamic content tags from being
  processed as shortcodes when a form is embedded with its block, allowing
  unauthenticated vis…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-74
product: 'MC4WP: Mailchimp for WordPress'
affected:
  - mc4wp_mailchimp_for_wordpress < 4.15.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T11:41:32.175152Z'
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T11:50:26.524Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118166'
references:
  - url: 'https://wpscan.com/vulnerability/a8b2a564-25ae-4ed8-9c2c-989b104ba4c8/'
tags:
  - cve.org
ingestedAt: '2026-11-06T07:47:15.874Z'
epss: 0.00177
epssPercentile: 0.07325
---

## Overview

The MC4WP: Mailchimp for WordPress WordPress plugin before 4.15.0 does not prevent request-derived values in its dynamic content tags from being processed as shortcodes when a form is embedded with its block, allowing unauthenticated visitors to execute arbitrary registered shortcodes with attacker-chosen attributes. This requires the site owner to have added a request-derived tag to the form content and to embed the form with the block rather than the classic shortcode.

## Affected

- `mc4wp_mailchimp_for_wordpress < 4.15.0`

## Remediation

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