GetPaid vulnerabilities

The GetPaid plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'mmdwqzpoxadd' parameter in all versions up to and including 2.8.61 due to insufficient input sanitization and output escaping. Unauthenticated attackers can inject arbitrary web scripts that execute when an administrator views the affected payment form.

The GetPaid WordPress plugin before 2.8.55 does not verify the authenticity of incoming Worldpay payment notifications. This allows unauthenticated attackers to forge a notification that marks a pending invoice as paid without any payment being made.

The GetPaid plugin for WordPress up to version 2.8.56 contains a Local File Inclusion (LFI) vulnerability via the getpaid_payment_form_element function. Authenticated attackers with administrator-level access and above can include and execute arbitrary .php files on the server, allowing PHP code execution.