PrestaShop Checkout Backoffice directory traversal allows arbitrary file disclosure

PrestaShop Checkout is the PrestaShop official payment module in partnership with PayPal. In versions prior to 4.4.1 and 5.0.5, the backoffice is missing validation on input resulting in a directory traversal and arbitrary file disclosure. The vulnerability is fixed in versions 4.4.1 and 5.0.5. No known workarounds exist.