PrestaShop is an open source e-commerce web application. Prior to version 8.1.1, it is possible to delete files from the server via the CustomerMessage API. Version 8.1.1 contains a patch for this issue. There are no known workarounds.
https://github.com/PrestaShop/PrestaShop/security/advisories/GHSA-v4gr-v679-42p7
https://github.com/PrestaShop/PrestaShop/commit/6ce750b2367a7309b6bf50166f1873cb86ad57e9