CVE-2026-118167

MC4WP: Mailchimp for WordPress <= 4.14.0 - Missing Authorization

2026-11-04 00:00

Strategic Overview

Status: Patched in 4.15.0
Affected Plugin: MC4WP: Mailchimp for WordPress
Affected Version: <= 4.14.0
CVSS: 5.3Medium
Weakness type: CWE-863 · Incorrect Authorization
CVE: CVE-2026-118167

View all MC4WP: Mailchimp for WordPress vulnerabilities

At a glance

CVE-2026-118167 is a medium-severity Incorrect Authorization vulnerability in the MC4WP WordPress plugin, affecting versions <= 4.14.0. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 4.15.0; sites on affected versions should update now. Disclosed November 2026, reported by Karthik Ramakrishnan.

Vulnerability Overview

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to unauthorized access in all versions up to, and including, 4.14.0. This is due to a missing capability check on a function. This makes it possible for unauthenticated attackers to perform an unauthorized action.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-863: Incorrect Authorization

Reaching this weakness in MC4WP <= 4.14.0 takes a caller who can reach the endpoint. Incorrect authorization means a permission check exists but evaluates the wrong thing, so it passes for callers it was meant to stop.

The action runs for users the code intended to exclude, with the same effect as having no check at all. For MC4WP the fix is 4.15.0: builds <= 4.14.0 are affected, anything from 4.15.0 onward is not.

Remediation

Update to version 4.15.0, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: MC4WP 4.15.0 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-118167 https://www.wordfence.com/threat-intel/vulnerabilities/id/9c5c1ec8-e03a-45ef-a9b0-f31f038e749a https://nvd.nist.gov/vuln/detail/CVE-2026-118167

Related records

Other vulnerabilities in MC4WP: Mailchimp for WordPress

CVSS Vector

5.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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