In Horde Groupware 5.2.19 and 5.2.21, there is XSS via the Color field in a Create Task List action.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "5.2.19"
},
{
"introduced": "0"
},
{
"last_affected": "5.2.21"
}
]
}