Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/user-registration/tags/5.1.4/includes
- https://plugins.trac.wordpress.org/browser/user-registration/trunk/includes/func
- https://www.wordfence.com/threat-intel/vulnerabilities/id/020bed37-9544-49b7-941
FAQ
What is CVE-2026-6203?
CVE-2026-6203 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 th...
How severe is CVE-2026-6203?
CVE-2026-6203 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-6203?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.