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-2017-16907 not yet assigned priority: Debian including 2 source packages (php-horde, php-horde-core), 6 status rows across 3 suites (bookworm, bullseye, sid): resolved 6.
In Horde Groupware 5.2.19 and 5.2.21, there is XSS via the Color field in a Create Task List action.