CVE-2016-10033 The mailSend function in the isMail transport in PHPMailer before 5.2.18, when the Sender property is not set, might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a \" in a crafted From address. Fixed In Version phpmailer 5.2.18 Reference CVE-2016-10045 The isMail transport in PHPMailer before 5.2.20, when the Sender property is not set, might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code by leveraging improper interaction between the escapeshellarg function and internal escaping performed in the mail function. NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-10033. Fixed in Version phpmailer 5.2.20 Reference