The GiveWP WordPress plugin before 4.19.0.1 does not restrict the currency of a donation to the one the site or form accepts, while comparing its amount limits as bare numbers, allowing unauthenticated users to make donations below a form's configured minimum or fixed amount.
https://wpscan.com/vulnerability/2d7c0c89-7f0e-4f2b-908f-7d96e1d8a228/