The Express Entries Dashboard in Concrete5 8.5.4 allows stored XSS via the name field of a new data object at an index.php/dashboard/express/entries/view/ URI.
{ "versions": [ { "introduced": "0" }, { "fixed": "8.5.5" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3111.json"