Cross-site scripting (XSS) vulnerability in pie-register/pie-register.php in the Pie Register plugin before 2.0.19 for WordPress allows remote attackers to inject arbitrary web script or HTML via the invitaion_code parameter in a pie-register page to the default URI.
The Pie Register plugin before 2.0.14 for WordPress does not properly restrict access to certain functions in pie-register.php, which allows remote attackers to (1) add a user by uploading a crafted CSV file or (2) activate a user account via a verifyit action.