CVE-2021-28585
Magento versions 2.4.2 (and earlier), 2.4.1-p1 (and earlier) and 2.3.6-p1 (and earlier) are affected by an Improper input validation vulnerability in the New customer WebAPI.Successful exploitation could allow an attacker to send unsolicited spam e-mails.
Date published : 2021-06-28
https://helpx.adobe.com/security/products/magento/apsb21-30.html