The Paid Membership Subscriptions WordPress plugin before 3.0.7 does not protect the member and payment export files it writes to a predictable location in the uploads directory, allowing unauthenticated users to download the exported member and payment data (including PII) while an export artifact is present.
https://wpscan.com/vulnerability/306a498d-0740-479b-b182-71fc3d7452bb/