CVE-2016-10033 (phpmailer)

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 " (backslash double quote) in a crafted From address.

Source: CVE-2016-10033 (phpmailer)