User Registration & Membership <= 5.1.4 - Unauthenticated Open Redirect via 'redirect_to_on_logout' Parameter
| CVE | CVE-2026-6203 |
|---|---|
| CVSS | 6.1 (Medium) |
| Publicly Published | April 13, 2026 |
| Last Updated | April 21, 2026 |
| Researchers |
Anthony Cihan (Hann1bl3L3ct3r)
- Obviam
Louis Deschanel (JeanJeanLeHaxor) - Patrowl Pascal SUN - Patrowl |
Description
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.
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Vulnerability Details for User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
| Software Type | Plugin |
|---|---|
| Software Slug | user-registration (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 5.1.5, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
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