WordPress plugin
MC4WP: Mailchimp for WordPress security & vulnerabilities
No known unpatched vulnerabilities in the latest version
All 16 known vulnerabilities are fixed in the latest release. If you run an older version, update to null or newer.
- Critical0
- High1
- Medium15
- Low0
All MC4WP: Mailchimp for WordPress vulnerabilities
| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Missing Authorization ≤4.14.1Update to 4.15.0 | CVE-2026-27356 | |
| Medium6.5 | Unauthenticated Arbitrary Shortcode Execution ≤4.14.0Update to 4.15.0 | CVE-2026-118166 | |
| Medium5.3 | Missing Authorization ≤4.14.0Update to 4.15.0 | CVE-2026-118167 | |
| Medium6.1 | Reflected Cross-Site Scripting via 'data' Dynamic Content Tag ≤4.14.0Update to 4.14.1 | CVE-2026-87917 | |
| Medium6.4 | Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages ≤4.12.0Update to 4.12.1 | CVE-2026-4561 | |
| Medium6.5 | Missing Authorization to Unauthenticated Arbitrary Subscription Deletion ≤4.11.1Update to 4.12.0 | CVE-2026-1781 | |
| Medium4.4 | Authenticated (Administrator+) Stored Cross-Site Scripting ≤4.9.16Update to 4.9.17 | CVE-2024-8680 | |
| Medium6.1 | 4.9.16 - Reflected Cross-Site Scripting 4.9.9 – 4.9.16Update to 4.9.17 | CVE-2024-8850 | |
| Medium5.3 | Missing Authorization via listen ≤4.9.9Update to 4.9.10 | CVE-2023-51682 | |
| Medium5.5 | Authenticated (Admin+) Stored Cross-Site Scripting ≤4.8.6Update to 4.8.7 | CVE-2021-36833 | |
| Medium5.5 | Cross-Site Scripting <4.8.7Update to 4.8.7 | — | |
| High8.8 | Cross-Site Request Forgery ≤4.8.4Update to 4.8.5 | — | |
| Medium6.1 | Open Redirect ≤4.8.4Update to 4.8.5 | — | |
| Medium6.1 | Reflected Cross-Site Scripting ≤4.1.6Update to 4.1.7 | — | |
| Medium6.1 | Cross-Site Scripting ≤4.1.7Update to 4.1.8 | CVE-2017-18577 | |
| Medium6.1 | Reflected Cross-Site Scripting <4.0.11Update to 4.0.11 | CVE-2016-10871 |
- Medium5.3Missing Authorization
≤4.14.1Update to 4.15.0
- Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤4.14.0Update to 4.15.0
- Medium5.3Missing Authorization
≤4.14.0Update to 4.15.0
- Medium6.1Reflected Cross-Site Scripting via 'data' Dynamic Content Tag
≤4.14.0Update to 4.14.1
- Medium6.4Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages
≤4.12.0Update to 4.12.1
- Medium6.5Missing Authorization to Unauthenticated Arbitrary Subscription Deletion
≤4.11.1Update to 4.12.0
- Medium4.4Authenticated (Administrator+) Stored Cross-Site Scripting
≤4.9.16Update to 4.9.17
- Medium6.14.9.16 - Reflected Cross-Site Scripting
4.9.9 – 4.9.16Update to 4.9.17
- Medium5.3Missing Authorization via listen
≤4.9.9Update to 4.9.10
- Medium5.5Authenticated (Admin+) Stored Cross-Site Scripting
≤4.8.6Update to 4.8.7
- Medium5.5Cross-Site Scripting
<4.8.7Update to 4.8.7
- High8.8Cross-Site Request Forgery
≤4.8.4Update to 4.8.5
- Medium6.1Open Redirect
≤4.8.4Update to 4.8.5
- Medium6.1Reflected Cross-Site Scripting
≤4.1.6Update to 4.1.7
- Medium6.1Cross-Site Scripting
≤4.1.7Update to 4.1.8
- Medium6.1Reflected Cross-Site Scripting
<4.0.11Update to 4.0.11
MC4WP: Mailchimp for WordPress: common questions
Does MC4WP: Mailchimp for WordPress have known vulnerabilities?
Yes. VulnCrest Radar lists 16 known vulnerabilities in MC4WP: Mailchimp for WordPress: 1 high, 15 medium. None are known to affect version null.
How do I check which version of MC4WP: Mailchimp for WordPress I run?
In wp-admin open Plugins → Installed Plugins; the version is shown under the name. Without admin access, our passive Check my site tool can often read it from public files.
What is the most recent MC4WP: Mailchimp for WordPress vulnerability?
CVE-2026-27356, published Nov 6, 2026: MC4WP: Mailchimp for WordPress <= 4.14.1 - Missing Authorization. Severity: Medium (CVSS 5.3).
Is any MC4WP: Mailchimp for WordPress vulnerability listed in CISA KEV?
No. None of the known MC4WP: Mailchimp for WordPress vulnerabilities is currently listed in the CISA KEV catalog.