CVE-2024-11326: Fatcatapps Campaign Monitor Forms By Optin Cat

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

The Campaign Monitor Forms by Optin Cat plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 2.5.7. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected products

• Fatcatapps Campaign Monitor Forms By Optin Cat: up to and including 2.5.7

Published 2024-12-03. Last modified 2026-06-17.