It was found that the Apache Syncope EndUser UI login page prio to 2.0.15 and 2.1.6 reflects the successMessage parameters. By this mean, a user accessing the Enduser UI could execute javascript code from URL query string.
{
"severity": "LOW",
"github_reviewed": true,
"cwe_ids": [
"CWE-79"
],
"github_reviewed_at": "2021-05-25T20:49:00Z",
"nvd_published_at": "2020-05-04T13:15:00Z"
}