What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
The FuseWP plugin for WordPress is vulnerable to cross-site request forgery (CSRF) attacks. An attacker can craft a malicious webpage that, when visited by a logged-in WordPress admin, performs unwanted actions on the site without the admin's knowledge or consent. This affects all versions up to 1.1.23.0. Site owners should update the plugin to a version newer than 1.1.23.0 when available.
What an attacker can do
03Attacker Capabilities
Perform unwanted actions on a WordPress site by tricking an admin into visiting a malicious webpage.
Potential impact on your site
04Site Impact
An attacker can modify plugin settings or trigger unintended actions affecting user sync and email list management.
Conditions required to exploit
05Prerequisites
Admin must be logged into WordPress and visit a page controlled by the attacker.
Key dates
06Disclosure timeline
October 25, 2025
CVE published
April 8, 2026
Record updated
