Zendesk Samlr before 2.6.2 allows an XML nodes comment attack such as a name_id node with user@example.com followed by <!---->. and then the attacker's domain name.
{
"cwe_ids": [
"CWE-20"
],
"github_reviewed": true,
"github_reviewed_at": "2019-07-31T03:49:20Z",
"nvd_published_at": "2019-07-26T12:15:00Z",
"severity": "HIGH"
}