The Font Awesome WordPress plugin before 4.3.2 does not validate and escapes some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as a contributor to perform Stored Cross-Site Scripting attacks against logged-in admins.
https://wpscan.com/vulnerability/4de75de5-e557-46df-9675-e3f0220f4003