The Testimonials WordPress plugin before 2.7, super-testimonial-pro WordPress plugin before 1.0.8 do not sanitize and escape its settings, allowing high privilege users such as admin to perform cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.
https://wpscan.com/vulnerability/ab3b0052-1a74-4ba3-b6d2-78cfe56029db