The User Registration & Membership plugin for WordPress is vulnerable to Open Redirect in versions up to and including 5.1.4. This is due to insufficient validation of user-supplied URLs passed via the 'redirect_to_on_logout' GET parameter before redirecting users. The `redirect_to_on_logout` GET parameter is passed directly to WordPress's `wp_redirect()` function instead of the domain-restricted `wp_safe_redirect()`. While `esc_url_raw()` is applied to sanitize malformed URLs, it does not restrict the redirect destination to the local domain, allowing an attacker to craft a specially formed link that redirects users to potentially malicious external URLs after logout, which could be used to facilitate phishing attacks.
| Vendor | Product | Versions |
|---|---|---|
| wpeverest | user registration & membership – free & paid memberships, subscriptions, content restriction, user profile, custom user registration & login builder | 0 |
Updated description with CVE-2026-6203 and clarified that no exploit exists.
Initial creation
