CVE-2026-7520

Vulnerability 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.

CVSS Score

Related Weaknesses (CWE)

References

• https://plugins.trac.wordpress.org/browser/mailchimp-forms-by-mailmunch/tags/3.2
• https://plugins.trac.wordpress.org/browser/mailchimp-forms-by-mailmunch/tags/3.2
• https://plugins.trac.wordpress.org/browser/mailchimp-forms-by-mailmunch/tags/3.2
• https://plugins.trac.wordpress.org/browser/mailchimp-forms-by-mailmunch/tags/3.2
• https://plugins.trac.wordpress.org/browser/mailchimp-forms-by-mailmunch/tags/3.2
• https://plugins.trac.wordpress.org/browser/mailchimp-forms-by-mailmunch/trunk/ad
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new
• https://www.wordfence.com/threat-intel/vulnerabilities/id/c9d00ee8-b9df-4044-a5e