CSRF in Fusewp – WordPress User Sync To Email List & Marketing Automation (Mailchimp, Constant Contact, Activecampaign Etc.)

CVE-2025-11976

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.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.001 (2.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-11976: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-11976?
CVE-2025-11976 is a medium-severity vulnerability in Fusewp – WordPress User Sync To Email List & Marketing Automation (Mailchimp, Constant Contact, Activecampaign Etc.), classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2025-10-25.
How severe is CVE-2025-11976?
Medium severity. CVSS v3 base score is 4.3 out of 10.