Vulnerabilidades do Metagauss RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login

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.

The RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress is vulnerable to payment bypass due to insufficient verification of data authenticity on the 'process_paypal_sdk_payment' function in all versions up to, and including, 6.0.6.9. This is due to the plugin trusting client-supplied values for payment verification without validating that the payment actually went through PayPal. This makes it possible for unauthenticated attackers to bypass paid registration by manipulating payment status and activating their account without completing a real PayPal payment.

The RegistrationMagic plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 6.0.7.4. This is due to missing nonce verification and capability checks on the rm_set_otp AJAX action handler. This makes it possible for unauthenticated attackers to modify arbitrary plugin settings, including reCAPTCHA keys, security settings, and frontend menu titles.

The RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'RM_Forms' shortcode in all versions up to, and including, 6.0.6.7 due to insufficient input sanitization and output escaping on the 'theme' attribute. This makes it possible for authenticated attackers, with contributor level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.