The RegistrationMagic WordPress plugin before 6.0.9.4 does not properly validate that a one-time password presented in a cookie belongs to the identity being requested before returning front-end form submissions, allowing unauthenticated attackers to read other users' form submission data, including personal information.
https://wpscan.com/vulnerability/21fa84b9-afa6-49f7-abb1-c1edabda3cd8/