In PrestaShop between versions 1.7.6.0 and 1.7.6.5, there is a reflected XSS with `back` parameter. The problem is fixed in 1.7.6.5
https://github.com/PrestaShop/PrestaShop/security/advisories/GHSA-j3r6-33hf-m8wh
https://github.com/PrestaShop/PrestaShop/commit/b6aea152988d81e1586f1c03f2e72c9ef2fe7df7
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-5285