CVE-2026-19660

9.8 CRITICAL

Published 2026-10-02 · Updated 2026-10-03

AI risk analysis

Summary: The Divi Membership plugin for WordPress allows unauthenticated attackers to bypass authentication by manipulating the `paypal_param` GET parameter, leading to full site takeover.
Exploitability: Exploitation is relatively easy as it requires only supplying an arbitrary user ID in the `paypal_param` GET parameter. Precondition is that the plugin is installed and the `process_paypal_callback` function is triggered.
Blast radius: If exploited, the vulnerability could result in full control over the WordPress site, including access to administrative functions and data.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Disable the Divi Membership plugin or upgrade to version 2.3.1 or later.

auth-bypasswebwp-plugin

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-287

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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