The Paid Memberships Pro WordPress plugin before 2.6.6 does not escape the s parameter before outputting it back in an attribute in an admin page, leading to a Reflected Cross-Site Scripting
{ "versions": [ { "introduced": "0" }, { "fixed": "2.6.6" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-24979.json"