An issue WinMail v.7.1 and v.5.1 and before allows a remote attacker to execute arbitrary code via a crafted script to the email parameter.

A SSRF vulnerability exists in Winmail 6.5 in app.php in the key parameter when HTTPS is on. An attacker can use this vulnerability to cause the server to send a request to a specific URL. An attacker can modify the request header 'HOST' value to cause the server to send the request.

A reflected XSS vulnerability exists in tohtml/convert.php of Winmail 6.5, which can cause JavaScript code to be executed.