The Favicon by RealFaviconGenerator WordPress plugin before 1.3.23 does not properly sanitise and escape the json_result_url parameter before outputting it back in the Favicon admin dashboard, leading to a Reflected Cross-Site Scripting issue
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.