An issue was discovered in Orchard before 1.10. The Media Settings Allowed File Types list field allows an attacker to add a XSS payload that will execute when users attempt to upload a disallowed file type, causing the error to display.
https://github.com/OrchardCMS/Orchard/releases
https://burninatorsec.blogspot.com/2021/04/cve-2020-29592-and-cve-2020-29593.html