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.
{ "versions": [ { "introduced": "0" }, { "fixed": "2.6.2" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20857.json"