The Everest Forms WordPress plugin before 3.5.0 does not reliably delete temporary CSV files generated during email-notification processing and leaves them publicly accessible in the uploads directory, allowing unauthenticated attackers to retrieve other users' form submission records via predictable, enumerable filenames.
https://wpscan.com/vulnerability/4bd381e9-2f4e-4e61-99af-88f50aed71f5/