---
id: "CVE-2026-118167"
page: "https://infrastack.ai/live/CVE-2026-118167"
kind: "vulnerability"
aliases: ["CVE-2026-118167"]
title: "WordPress MC4WP Mailchimp plugin lets visitors subscribe to any audience"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mailchimp", "mc4wp", "package", "wordpress"]
not_affected_if: ["no-mailchimp-connection", "plugin-4.15.0-or-later"]
published_at: "2026-11-06T06:16:40+00:00"
first_seen_at: "2026-11-06T06:40:12+00:00"
updated_at: "2026-11-06T06:41:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118167", "first_seen_at": "2026-11-06T06:40:12+00:00"}]
exploit_sources: []
---

# WordPress MC4WP Mailchimp plugin lets visitors subscribe to any audience

Link for people: https://infrastack.ai/live/CVE-2026-118167 (this .md is for agents)

The MC4WP: Mailchimp for WordPress plugin before 4.15.0 does not check that a sign-up form subscribes visitors to the audience the site owner configured. An unauthenticated visitor can add arbitrary email addresses to any other audience in the site's connected Mailchimp account.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed version of the MC4WP: Mailchimp for WordPress plugin in the WordPress admin plugins list; versions below `4.15.0` are in scope.
- Review which Mailchimp audiences the connected account holds, since any of them could be targeted.

## Fix

- MC4WP: Mailchimp for WordPress plugin: `4.15.0` or later.

## Timeline

- 2026-11-06T06:40:12+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118167

## From the sources

The MC4WP: Mailchimp for WordPress plugin before 4.15.0 does not validate that the Mailchimp audience a sign-up form or bundled integration subscribes a visitor to matches the audience configured by the site owner, allowing unauthenticated visitors to subscribe arbitrary email addresses to any other audience in the site's connected Mailchimp account.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_