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CVE-2026-1321— Membership Plugin – Restrict Content <= 3.2.20 - Unauthenticated Privilege Escalation via 'rcp_level'

Quick assessment

Affected
stellarwp Membership Plugin – Restrict Content
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 Membership Plugin – Restrict Content 3.2.20及之前版本存在安全漏洞，该漏洞源于rcp_setup_registration_init函数接受未经验证的rcp_level参数，

CVSS 8.1 · High EPSS 0.36% · P28
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I. Basic Information for CVE-2026-1321

Vulnerability Information
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Vulnerability Title
Membership Plugin – Restrict Content <= 3.2.20 - Unauthenticated Privilege Escalation via 'rcp_level'
Source: CVE Program / CVE List V5
Vulnerability Description
The Membership Plugin – Restrict Content plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.2.20. This is due to the `rcp_setup_registration_init()` function accepting any membership level ID via the `rcp_level` POST parameter without validating that the level is active or that payment is required. Combined with the `add_user_role()` method which assigns the WordPress role configured on the membership level without status checks, this makes it possible for unauthenticated attackers to register with any membership level, including inactive levels that grant privileged WordPress roles such as Administrator, or paid levels that charge a sign-up fee. The vulnerability was partially patched in version 3.2.18.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Membership Plugin – Restrict Content 安全漏洞
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 Membership Plugin – Restrict Content 3.2.20及之前版本存在安全漏洞，该漏洞源于rcp_setup_registration_init函数接受未经验证的rcp_level参数，
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

Vendor Product Affected Versions CPE Subscribe
stellarwp Membership Plugin – Restrict Content * ~ 3.2.20 -

II. Public POCs for CVE-2026-1321

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III. Intelligence Information for CVE-2026-1321

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Patches & Fixes for CVE-2026-1321 (6)

Vendor Advisories for CVE-2026-1321 (1)

IV. Related Vulnerabilities

Same product: Membership Plugin – Restrict Content
Same vendor: stellarwp
Same weakness: CWE-862

V. Comments for CVE-2026-1321

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