MC4WP: Mailchimp for WordPress <= 4.11.1 - Missing Authorization to Unauthenticated Arbitrary Subscription Deletion
| CVE | CVE-2026-1781 |
|---|---|
| CVSS | 6.5 (Medium) |
| Publicly Published | March 10, 2026 |
| Last Updated | March 11, 2026 |
| Researcher |
Sarawut Poolkhet (MisterHelloz)
|
Description
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).
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- cwe.mitre.org
- github.com
- plugins.trac.wordpress.org
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Vulnerability Details for MC4WP: Mailchimp for WordPress
| Software Type | Plugin |
|---|---|
| Software Slug | mailchimp-for-wp (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 4.12.0, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in MC4WP: Mailchimp for WordPress
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