View at Official debian advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2017-16906 not yet assigned priority: Debian including 1 source packages (php-horde-kronolith), 3 status rows across 3 suites (bookworm, bullseye, sid): resolved 3.
In Horde Groupware 5.2.19-5.2.22, there is XSS via the URL field in a "Calendar -> New Event" action.