MailChimp Forms by MailMunch, CVE-2026-7520

CVE, Research URL: CVE-2026-7520
Home page URL: Security reports for MailChimp Forms by MailMunch
Application: MailChimp Forms by MailMunch
Published on: Aug 05, 2026
Research Description: 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 versions: max 3.2.8.
Status: vulnerable