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CVE-2026-19660— Divi Membership <= 2.3.0 - Unauthenticated Authentication Bypass via 'paypal_param' Parameter

Quick assessment

Affected
DiviEngine Divi 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.

WordPress 的 Divi Membership 插件在所有版本（含 2.3.0 及以下版本）中存在身份验证绕过漏洞。 函数通过钩子绑定到 动作，接受一个未经 IPN（即时付款通知）验证、无加密签名检查、无所有权验证、也无不一次令牌（nonce）保护的 base64 编码 GET 参数。这使得攻击者可以完全控制传递的用户 ID 值，该值随后被直接传入 和 ，从而导致攻击者能够以任意现有 WordPress 用户（包括管理员）的身份进行登录，通过提供任意的用户 ID 作为 GET 参数，可实现对整个网站的完全接

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-19660

Vulnerability Information
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Vulnerability Title
Divi Membership <= 2.3.0 - Unauthenticated Authentication Bypass via 'paypal_param' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Divi Membership plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.3.0. The `process_paypal_callback` function, hooked to the `init` action, accepts a base64-encoded `paypal_param` GET parameter with no IPN validation, no cryptographic signature check, no ownership verification, and no nonce, allowing it to trust an entirely attacker-controlled user ID value that is passed directly to `wp_set_current_user()` and `wp_set_auth_cookie()`. This makes it possible for unauthenticated attackers to log in as any existing WordPress user — including administrators — by supplying an arbitrary user ID in the `paypal_param` GET parameter, resulting in full site takeover. The vulnerability is further compounded by the fact that the PayPal gateway class is instantiated unconditionally regardless of whether PayPal is enabled or configured, ensuring the vulnerable hook is always registered on every front-end request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
DiviEngine Divi Membership 0 ~ 2.3.0 -

II. Public POCs for CVE-2026-19660

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III. Intelligence Information for CVE-2026-19660

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Vendor Advisories for CVE-2026-19660 (1)

Other References for CVE-2026-19660 (1)

IV. Related Vulnerabilities

Same product: Divi Membership
Same vendor: DiviEngine
Same weakness: CWE-287

V. Comments for CVE-2026-19660

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