MC4WP: Mailchimp for WordPress vulnerabilities
Plugin slug mailchimp-for-wp · 16 known vulnerabilities · latest disclosed 2026-11-06 · WordPress.org page
Every listed vulnerability has a fix. Version 4.15.0 or later is not affected by any of them. If your site runs an older version, update it.
1 of 16 rated high or critical (CVSS 7 or more).
Known vulnerabilities in MC4WP: Mailchimp for WordPress
| Severity | Affected versions | Fixed in | CVE | Published | Details |
|---|---|---|---|---|---|
| Medium 5.3 | <= 4.14.1 | 4.15.0 | CVE-2026-27356 | 2026-11-06 | Advisory |
| Medium 5.3 | <= 4.14.0 | 4.15.0 | CVE-2026-118167 | 2026-11-04 | Advisory |
| Medium 6.5 | <= 4.14.0 | 4.15.0 | CVE-2026-118166 | 2026-11-04 | Advisory |
| Medium 6.1 | <= 4.14.0 | 4.14.1 | CVE-2026-87917 | 2026-09-18 | Advisory |
| Medium 6.4 | <= 4.12.0 | 4.12.1 | CVE-2026-4561 | 2026-08-21 | Advisory |
| Medium 6.5 | <= 4.11.1 | 4.12.0 | CVE-2026-1781 | 2026-03-10 | Advisory |
| Medium 4.4 | <= 4.9.16 | 4.9.17 | CVE-2024-8680 | 2024-09-20 | Advisory |
| Medium 6.1 | 4.9.9 to 4.9.16 | 4.9.17 | CVE-2024-8850 | 2024-09-18 | Advisory |
| Medium 5.3 | <= 4.9.9 | 4.9.10 | CVE-2023-51682 | 2023-12-27 | Advisory |
| Medium 5.5 | <= 4.8.6 | 4.8.7 | CVE-2021-36833 | 2022-03-02 | Advisory |
| Medium 5.5 | < 4.8.7 | 4.8.7 | none | 2022-03-02 | Advisory |
| High 8.8 | <= 4.8.4 | 4.8.5 | none | 2021-06-01 | Advisory |
| Medium 6.1 | <= 4.8.4 | 4.8.5 | none | 2021-06-01 | Advisory |
| Medium 6.1 | <= 4.1.6 | 4.1.7 | none | 2019-11-09 | Advisory |
| Medium 6.1 | <= 4.1.7 | 4.1.8 | CVE-2017-18577 | 2017-09-08 | Advisory |
| Medium 6.1 | < 4.0.11 | 4.0.11 | CVE-2016-10871 | 2016-12-13 | Advisory |
Check if a site is affected
Enter a site address to see which version of MC4WP: Mailchimp for WordPress and other plugins it runs, and whether they match a known vulnerability.
Questions
Is the MC4WP: Mailchimp for WordPress plugin safe to use?
All 16 known issues are fixed in current versions (4.15.0 or later). Keeping it updated is what matters.
How do I check which version of MC4WP: Mailchimp for WordPress my site runs?
In WordPress go to Plugins > Installed Plugins. From the outside, the free PluginPeek scan below reads the version from the site's public files.
How do I fix a vulnerable plugin?
Make a full backup, then update it from Dashboard > Updates and check the site afterwards. If you would rather not, we can do it for a fixed $99, paid after you have checked the site.