Magento Commerce versions 2.4.2 (and earlier), 2.4.2-p1 (and earlier) and 2.3.7 (and earlier) are affected by an improper input validation vulnerability while saving a customer's details with a specially crafted file. An authenticated attacker with admin privileges can leverage this vulnerability to achieve remote code execution.
https://helpx.adobe.com/security/products/magento/apsb21-64.html