What is CVE-2026-118167?

CVE-2026-118167 is a medium-severity vulnerability in Mc4wp: Mailchimp For WordPress, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2026-11-06.

How severe is CVE-2026-118167?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Mc4wp: Mailchimp For WordPress

CVE-2026-118167

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.

Vulnerability class: Broken Access Control

Published 2026-11-06 · last modified 2026-11-06.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Mc4wp: Mailchimp For WordPress

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

wpscan.com/vulnerability/11752539-1dc8-4adb-a680-ce7ecaaff4d1/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-118167?: CVE-2026-118167 is a medium-severity vulnerability in Mc4wp: Mailchimp For WordPress, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2026-11-06.
How severe is CVE-2026-118167?: Medium severity. CVSS v3 base score is 5.3 out of 10.