WP Shieldon 1.6.3 - Unauthenticated Cross-Site Scripting (XSS)

Unvalidated input and lack of output encoding in the WP Shieldon WordPress plugin, version 1.6.3 and below, leads to Unauthenticated Reflected Cross-Site Scripting (XSS) when the CAPTCHA page is shown could lead to privileged escalation.