In Horde Groupware 5.2.19-5.2.22, there is XSS via the URL field in a "Calendar -> New Event" action.
{ "versions": [ { "introduced": "5.2.19" }, { "last_affected": "5.2.22" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-16906.json"