Fortinet Fortimail 5.1.6

An unauthenticated XSS vulnerability with FortiMail 5.0.0 - 5.2.9 and 5.3.0 - 5.3.8 could allow an attacker to execute arbitrary scripts in the security context of the browser of a victim logged in FortiMail, assuming the victim is social engineered into clicking an URL crafted by the attacker.