Post SMTP < 2.1.4 - Admin+ Stored Cross-Site Scripting

The plugin does not escape some of its settings before outputting them in the admins dashboard, allowing high privilege users to perform Cross-Site Scripting attacks against other users even when the unfiltered_html capability is disallowed.

Put the following payload in the Post SMTP > Settings > Advanced > "Temporary Directory" settings: /tmp" style=animation-name:rotation onanimationstart=alert(/XSS/)//