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CVE-2026-11964— User Registration & Membership < 5.2.2 - Unauthenticated PayPal Webhook Signature Verification Bypass Leading to Membership Activation

Quick assessment

Affected
Unknown User Registration & Membership
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.

wpeverest user registration & membership是wpeverest公司开源的一个用户注册与会员管理插件。 WordPress User Registration & Membership 5.2.2之前版本存在授权问题漏洞，该漏洞源于未验证传入支付提供商webhook通知的真实性，可能导致未经身份验证的攻击者伪造支付批准事件并激活付费会员订阅而无需完成实际支付。

AI Predicted 8.6 Difficulty: Easy EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown User Registration & Membership < 5.2.2 affected
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I. Basic Information for CVE-2026-11964

Vulnerability Information
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Vulnerability Title
User Registration & Membership < 5.2.2 - Unauthenticated PayPal Webhook Signature Verification Bypass Leading to Membership Activation
Source: CVE Program / CVE List V5
Vulnerability Description
The User Registration & Membership WordPress plugin before 5.2.2 does not verify the authenticity of incoming payment-provider webhook notifications before acting on them, allowing unauthenticated attackers to forge a payment-approved event and activate a paid membership subscription without completing a real payment.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress user registration & membership 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wpeverest user registration & membership是wpeverest公司开源的一个用户注册与会员管理插件。 WordPress User Registration & Membership 5.2.2之前版本存在授权问题漏洞，该漏洞源于未验证传入支付提供商webhook通知的真实性，可能导致未经身份验证的攻击者伪造支付批准事件并激活付费会员订阅而无需完成实际支付。
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
Unknown User Registration & Membership 0 ~ 5.2.2 -

II. Public POCs for CVE-2026-11964

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III. Intelligence Information for CVE-2026-11964

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Vendor Advisories for CVE-2026-11964 (1)

Same Patch Batch · Unknown · 2026-07-13 · 11 CVEs total

CVE-2026-12275 Tutor LMS < 3.9.13 - Subscriber+ Unauthorized Course Enrollment and Private Course Content
CVE-2026-12397 WP Job Portal < 2.5.5 - Subscriber+ Employer Email Disclosure via IDOR
CVE-2026-12582 Library Management System < 3.5.8 - Unauthenticated SQL Injection via book_id
CVE-2026-12396 WP Job Portal < 2.5.5 - Subscriber+ Arbitrary Job Approval, Featuring and Rejection
CVE-2026-12081 Database for Contact Form 7, WPforms, Elementor forms < 1.5.2 - Unauthenticated PHP Object
CVE-2026-12273 Tutor LMS < 3.9.13 - Subscriber+ Arbitrary Auto-Approved Comment Creation
CVE-2026-12271 Tutor LMS < 3.9.13 - Subscriber+ Arbitrary Quiz Attempt Modification via IDOR
CVE-2026-12274 Tutor LMS < 3.9.13 - Instructor+ Arbitrary Post Overwrite via IDOR
CVE-2026-11963 User Registration & Membership < 5.2.2 - Subscriber+ Cross-User Role and Membership Tier M
CVE-2026-10551 Breeze Cache < 2.5.6 - Unauthenticated Stored XSS via Minify Library

IV. Related Vulnerabilities

Same product: User Registration & Membership
Same vendor: Unknown

V. Comments for CVE-2026-11964

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