CVE-2025-12172: Mailchimp List Subscribe Form

Medium severity, CVSS 4.3. EPSS: 0.1% chance of exploitation in the next 30 days.

The Mailchimp List Subscribe Form plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.0.0. This is due to missing or incorrect nonce validation on the mailchimp_sf_change_list_if_necessary() function. This makes it possible for unauthenticated attackers to change Mailchimp lists via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Affected products

• Mailchimp Mailchimp List Subscribe Form: up to and including 2.0.0

Published 2026-02-19. Last modified 2026-06-17.