Magento versions 2.4.2 (and earlier), 2.4.2-p1 (and earlier) and 2.3.7 (and earlier) are affected by an improper access control vulnerability within Magento's Media Gallery Upload workflow. By storing a specially crafted file in the website gallery, an authenticated attacker with administrative privilege can gain access to delete the .htaccess file. This could result in the attacker achieving remote code execution.

MISC:https://helpx.adobe.com/security/products/magento/apsb21-64.html | URL:https://helpx.adobe.com/security/products/magento/apsb21-64.html