Vulnerabilities / MailChimp Forms by MailMunch / WPSEC-2026-0830
MailChimp Forms by MailMunch <= 3.2.9 - Cross-Site Request Forgery to MailMunch Account Unlinking
Medium 4.3
CWE-352Fixed in 3.3.0
- ID
- WPSEC-2026-0830
- Plugin
- Mailmunch Forms for Mailchimp (mailchimp-forms-by-mailmunch)
- Affected
- all versions before 3.3.0
- Remediation
- Update to 3.3.0 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- Weakness
- CWE-352
- Usage
- Plugin Low · Affected versions None seen among sites WPSec scans, 2026-10-13
- Attack surface
- MailChimp Forms by MailMunch on WPSec AttackSurface
- Fix released
- Published
Description
The Mailmunch Forms for Mailchimp plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.2.9. This is due to missing nonce validation and a missing capability check on the 'sign_out' step of the plugin's admin page handler. This makes it possible for unauthenticated attackers to unlink the site's connected MailMunch account through a forged request, provided they can trick a logged-in site administrator into performing an action such as clicking a link.
References
- https://wpsec.com/vuln/WPSEC-2026-0830/
- https://plugins.svn.wordpress.org/mailchimp-forms-by-mailmunch/tags/3.3.0/
- https://wordpress.org/plugins/mailchimp-forms-by-mailmunch/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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