Favicon by RealFaviconGenerator <= 1.3.20 - Reflected Cross-Site Scripting (XSS)

The Favicon by RealFaviconGenerator WordPress plugin through 1.3.20 does not sanitise or escape one of its parameter before outputting it back in the response, leading to a Reflected Cross-Site Scripting (XSS) which is executed in the context of a logged administrator.