wpeverest User Registration & Membership Plugin up to 5.1.4 on WordPress wp_redirect redirect_to_on_logout

Summaryinfo

A vulnerability described as problematic has been identified in wpeverest User Registration & Membership Plugin up to 5.1.4 on WordPress. This impacts the function wp_redirect of the component User Registration Handler. Such manipulation of the argument redirect_to_on_logout leads to redirect. This vulnerability is listed as CVE-2026-6203. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in wpeverest User Registration & Membership Plugin up to 5.1.4 on WordPress and classified as problematic. Affected by this issue is the function wp_redirect of the component User Registration Handler. The manipulation of the argument redirect_to_on_logout with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. CVE summarizes:

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.

The weakness was presented by Anthony Cihan. The advisory is available at wordfence.com. This vulnerability is handled as CVE-2026-6203 since 04/13/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

Upgrading to version 5.1.4 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• wpeverest

Name

• User Registration & Membership Plugin

Version

• 5.1.0
• 5.1.1
• 5.1.2
• 5.1.3
• 5.1.4

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