CyberRota Analysis
AI-GeneratedThe Divi Membership plugin for WordPress is critically vulnerable to authentication bypass, allowing unauthenticated attackers to log in as any existing user, including administrators, by exploiting the `process_paypal_callback` function. This flaw arises from the lack of validation and verification mechanisms for user IDs passed via a base64-encoded `paypal_param` GET parameter, leading to potential full site takeover. WordPress site administrators using this plugin should prioritize immediate patching or disabling of the plugin to mitigate the risk of unauthorized access.
Original 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.