View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2017-16907 medium priority: Ubuntu including 2 source packages (php-horde, php-horde-core), 42 status rows across 21 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial, zesty): DNE 25, ignored 8, needed 4, not-affected 2, released 2, needs-triage 1.
In Horde Groupware 5.2.19 and 5.2.21, there is XSS via the Color field in a Create Task List action.