An XXE issue was discovered in Douchat 4.0.4 because Data\notify.php calls simplexmlloadstring. This can also be used for SSRF.
{ "versions": [ { "introduced": "0" }, { "last_affected": "4.0.4" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-18737.json"