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CVE-2026-6203— User Registration & Membership <= 5.1.4 - Unauthenticated Open Redirect via 'redirect_to_on_logout' Parameter

CVSS 6.1 · Medium EPSS 0.44% · P63
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I. Basic Information for CVE-2026-6203

Vulnerability Information
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Vulnerability Title
User Registration & Membership <= 5.1.4 - Unauthenticated Open Redirect via 'redirect_to_on_logout' Parameter
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin User Registration & Membership 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin User Registration & Membership 5.1.4及之前版本存在输入验证错误漏洞，该漏洞源于对redirect_to_on_logout GET参数验证不足，可能导致开放重定向攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
wpeverestUser Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder 0 ~ 5.1.4 -

II. Public POCs for CVE-2026-6203

#POC DescriptionSource LinkShenlong Link
1User Registration & Membership WordPress plugin <= 5.1.4 contains an open redirect caused by insufficient validation of 'redirect_to_on_logout' parameter, letting attackers redirect users to malicious external URLs after logout, exploit requires crafted URL. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-6203.yamlPOC Details
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III. Intelligence Information for CVE-2026-6203

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IV. Related Vulnerabilities

Same product: User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
Same vendor: wpeverest
Same weakness: CWE-601

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