CVE Catalog

CVE-2026-19660

CriticalCVSS 9.8
Published: Translated: NVD NIST

Summary

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 accepts a base64-encoded paypal_param GET parameter with no IPN validation, no cryptographic signature check, no ownership verification, and no nonce, allowing login as any existing user, including administrators.

Risk Assessment

An unauthenticated attacker can take over an administrator account and fully compromise the WordPress site.

Recommendation

Update the Divi Membership plugin to the latest version that fixes this vulnerability and check for any unauthorized access.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS