CVE-2026-5582: Fusewp – WordPress User Sync To Email List & Marketing Automation Mailchimp, Constant Contact, Activecampaign Etc

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

The FuseWP plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.1.24.2. This is due to missing nonce verification on the toggle_sync_status() function. This makes it possible for unauthenticated attackers to toggle the status of sync rules (enable/disable) 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 1.1.24.2

Published 2026-07-30. Last modified 2026-07-31.