CVE-2026-7520: Mailmunch Forms For Mailchimp

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

The MailChimp Forms by MailMunch plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the `sign_in()` and `sign_up()` AJAX handlers in all versions up to, and including, 3.2.7. This makes it possible for authenticated attackers, with Subscriber-level access and above, to relink the site's MailMunch integration to an attacker-controlled MailMunch account by submitting attacker-supplied credentials. Once relinked, all subscriber data captured by the plugin's forms is delivered to the attacker, and the forms/landing pages rendered on the site are pulled from the attacker's MailMunch account.

Affected products

• Mailmunch Mailmunch Forms For Mailchimp: up to and including 3.2.7

Published 2026-08-05. Last modified 2026-08-12.