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CVE-2026-9242— RegistrationMagic <= 6.0.8.6 - Authenticated (Subscriber+) Authentication Bypass via Forged PayPal IPN Request

Quick assessment

Affected
metagauss RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login
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.

metagauss registrationmagic是metagauss个人开发者开源的一个用户注册管理插件。 Metagauss RegistrationMagic 6.0.8.6及之前版本存在输入验证错误漏洞，该漏洞源于PayPal IPN callback处理器未经身份验证或nonce检查，且处理器在验证前更新包含攻击者控制的POST数据的付款日志数据库行，可能导致未经身份验证的攻击者通过提交伪造的IPN请求更新付款日志的user_id，然后访问成功返回URL获取身份验证cookie，进而绕过身份

CVSS 5.3 · Medium EPSS 0.34% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
metagauss RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login ≤ 6.0.8.6 affected
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I. Basic Information for CVE-2026-9242

Vulnerability Information
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Vulnerability Title
RegistrationMagic <= 6.0.8.6 - Authenticated (Subscriber+) Authentication Bypass via Forged PayPal IPN Request
Source: CVE Program / CVE List V5
Vulnerability Description
The RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress is vulnerable to Authentication Bypass via Insufficient Verification of Data Authenticity in all versions up to and including 6.0.8.6. This is due to the PayPal IPN `callback` handler being registered as a nopriv AJAX action with no authentication or nonce requirement, and critically because the handler updates the payment log database row with attacker-controlled POST data — including `payment_status` and the `custom` field encoding the target `user_id` — before PayPal IPN validation is performed, meaning the database remains poisoned even when validation subsequently fails. This makes it possible for unauthenticated attackers to authenticate as any WordPress user, including administrators, by submitting a forged IPN request that overwrites a payment log entry's `user_id` with that of a target account, then visiting the success return URL with a legitimately obtained security hash to cause the plugin to issue real WordPress authentication cookies for the targeted account.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Metagauss RegistrationMagic 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
metagauss registrationmagic是metagauss个人开发者开源的一个用户注册管理插件。 Metagauss RegistrationMagic 6.0.8.6及之前版本存在输入验证错误漏洞，该漏洞源于PayPal IPN callback处理器未经身份验证或nonce检查，且处理器在验证前更新包含攻击者控制的POST数据的付款日志数据库行，可能导致未经身份验证的攻击者通过提交伪造的IPN请求更新付款日志的user_id，然后访问成功返回URL获取身份验证cookie，进而绕过身份
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
metagauss RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login 0 ~ 6.0.8.6 -

II. Public POCs for CVE-2026-9242

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III. Intelligence Information for CVE-2026-9242

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Patches & Fixes for CVE-2026-9242 (7)

Other References for CVE-2026-9242 (1)

IV. Related Vulnerabilities

Same product: RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login
Same vendor: metagauss
Same weakness: CWE-345

V. Comments for CVE-2026-9242

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