---
id: CVE-2026-4561
title: >-
  The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to
  Stored Cross-Site Scripting via the form response message post meta fields
  (e.g., 'text_subscribed', 'text_error') in all versions up to, and including,
  4.12.0 due …
summary: >-
  The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to
  Stored Cross-Site Scripting via the form response message post meta fields
  (e.g., 'text_subscribed', 'text_error') in all versions up to, and including,
  4.12.0 due …
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
published: '2026-08-22'
updated: '2026-08-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4561'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/trunk/includes/forms/class-form-element.php#L116
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/trunk/includes/forms/class-form-manager.php#L104
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/mailchimp-for-wp/trunk/includes/forms/class-form.php#L295
    label: security@wordfence.com
  - url: 'https://plugins.trac.wordpress.org/changeset/3491781/'
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/641b739d-f888-4327-b1c5-c95de39ee011?source=cve
    label: security@wordfence.com
tags:
  - nvd
ingestedAt: '2026-08-23T04:42:14.859Z'
epss: 0.00317
epssPercentile: 0.24912
---

## Overview

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the form response message post meta fields (e.g., 'text_subscribed', 'text_error') in all versions up to, and including, 4.12.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-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.