The downloadZip function in application/controllers/admin/export.php in LimeSurvey through 3.16.1+190225 allows a relative path.
{ "versions": [ { "introduced": "0" }, { "last_affected": "3.16.1\\+190225" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-9960.json"