---
id: "CVE-2026-27356"
page: "https://infrastack.ai/live/CVE-2026-27356"
kind: "vulnerability"
aliases: ["CVE-2026-27356"]
title: "MC4WP Mailchimp for WP: missing authorization lets users bypass access controls"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mailchimp-for-wp", "mc4wp", "package", "wordpress"]
not_affected_if: ["plugin-not-installed"]
published_at: "2026-11-06T23:17:22+00:00"
first_seen_at: "2026-11-06T23:44:35+00:00"
updated_at: "2026-11-06T23:45:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27356", "first_seen_at": "2026-11-06T23:44:35+00:00"}]
exploit_sources: []
---

# MC4WP Mailchimp for WP: missing authorization lets users bypass access controls

Link for people: https://infrastack.ai/live/CVE-2026-27356 (this .md is for agents)

The MC4WP (Mailchimp for WP) WordPress plugin has a missing authorization check, so access control settings can be bypassed. An attacker may be able to reach functions they should not be allowed to use.

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

## How to check

- Check the installed plugin version in the WordPress admin under Plugins, or in `wp-content/plugins/mailchimp-for-wp/` for the plugin header.
- Confirm whether the installed version is `4.14.1` or earlier.

## Fix

- Move MC4WP to a version later than `4.14.1`; the exact fixed version is unknown from the sources.

## Timeline

- 2026-11-06T23:44:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-27356

## From the sources

Missing Authorization vulnerability in ibericode MC4WP mailchimp-for-wp allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MC4WP: from n/a through 4.14.1.

---

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