Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.
{ "versions": [ { "introduced": "6.3.0" }, { "fixed": "6.3.7.1" }, { "introduced": "6.4.0" }, { "fixed": "6.4.2" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-42567.json"