In Horde Groupware 5.2.19-5.2.22, there is XSS via the URL field in a "Calendar -> New Event" action.
{ "binaries": [ { "binary_version": "4.2.13-1ubuntu1", "binary_name": "php-horde-kronolith" } ] }
{ "binaries": [ { "binary_version": "4.2.23-1ubuntu1", "binary_name": "php-horde-kronolith" } ] }