The Get Custom Field Values WordPress plugin before 4.0 allows users with a role as low as Contributor to access other posts metadata without validating the permissions. Eg. contributors can access admin posts metadata.
{ "versions": [ { "introduced": "0" }, { "fixed": "4.0" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-24872.json"