The POST SMTP WordPress plugin before 2.8.7 does not sanitise and escape the msg parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.
{ "versions": [ { "introduced": "0" }, { "fixed": "2.8.7" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-6621.json"