Threat Entry Updated 2026-03-11

CVE-2026-1781 - Mailchimp For Wp Plugin

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 4.11.1. This is due to the plugin trusting the `_mc4wp_action` POST parameter without validation, allowing unauthenticated attackers to force the form to process unsubscribe actions instead of subscribe actions. This makes it possible for unauthenticated attackers to arbitrarily unsubscribe any email address from the connected Mailchimp audience via the `_mc4wp_action` parameter, granted they can obtain the form ID (which is publicly exposed in the HTML source).

PLUGIN Mailchimp For Wp

CVE-2026-1781

MEDIUM CVSS 6.5 2026-03-11

Risk Score

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Threat Entry Updated 2024-09-27

CVE-2024-8680 - Mailchimp For Wp Plugin

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 4.9.16 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

PLUGIN Mailchimp For Wp

CVE-2024-8680

MEDIUM CVSS 4.4 2024-09-21

Risk Score

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Threat Entry Updated 2024-09-25

CVE-2024-8850 - Mailchimp For Wp Plugin

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'email' parameter when a placeholder such as {email} is used for the field in versions 4.9.9 to 4.9.16 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

PLUGIN Mailchimp For Wp

CVE-2024-8850

MEDIUM CVSS 6.1 2024-09-19

Risk Score

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Threat Entry Updated 2026-01-20

CVE-2021-36833 - Mailchimp For Wp Plugin

Authenticated (admin or higher user role) Stored Cross-Site Scripting (XSS) vulnerability in ibericode's MC4WP plugin

PLUGIN Mailchimp For Wp

CVE-2021-36833

MEDIUM CVSS 4.8 2022-05-20

Risk Score

Open Full Technical Breakdown