CVE-2025-11976: Fusewp – WordPress User Sync To Email List & Marketing Automation Mailchimp, Constant Contact, Activecampaign Etc

Medium severity, CVSS 4.3. EPSS: 0.1% chance of exploitation in the next 30 days.

The FuseWP – WordPress User Sync to Email List & Marketing Automation (Mailchimp, Constant Contact, ActiveCampaign etc.) plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.1.23.0. This is due to missing or incorrect nonce validation on the save_changes function. This makes it possible for unauthenticated attackers to add or edit sync rules via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Affected products

• Fusewp Fusewp – WordPress User Sync To Email List & Marketing Automation Mailchimp, Constant Contact, Activecampaign Etc: up to and including 1.1.23.0

Published 2025-10-25. Last modified 2026-10-08.