The isMail transport in PHPMailer before 5.2.20 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 in PHP. NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-10033.
openwall.com/lists/oss-security/2016/12/28/1
packetstormsecurity.com/files/140286/PHPMailer-Remote-Code-Execution.html
packetstormsecurity.com/files/140350/PHPMailer-Sendmail-Argument-Injection.html
seclists.org/fulldisclosure/2016/Dec/81
www.rapid7.com/db/modules/exploit/multi/http/phpmailer_arg_injection
www.securityfocus.com/archive/1/539967/100/0/threaded
www.securityfocus.com/bid/95130
www.securitytracker.com/id/1037533
developer.joomla.org/security-centre/668-20161205-phpmailer-security-advisory.html
github.com/PHPMailer/PHPMailer/releases/tag/v5.2.20
github.com/PHPMailer/PHPMailer/wiki/About-the-CVE-2016-10033-and-CVE-2016-10045-vulnerabilities
legalhackers.com/advisories/PHPMailer-Exploit-Remote-Code-Exec-CVE-2016-10045-Vuln-Patch-Bypass.html
www.exploit-db.com/exploits/40969/
www.exploit-db.com/exploits/40986/
www.exploit-db.com/exploits/42221/