The User Registration & Membership – Custom Registration Form, Login Form, and User Profile plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 's' parameter in all versions up to, and including, 4.0.4 due to insufficient input sanitization and output escaping. 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.
Use CWE-79, Wpeverest vendor hub and User Registration product page to widen CVE-2025-1511 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2023-3342, CVE-2023-3343 and CVE-2022-3912 for nearby disclosures in the same product family.