Update the WordPress Smart Slider 3 plugin to the latest available version (at least 22.214.171.124).
Vlad Vector discovered and reported this Cross Site Scripting (XSS) vulnerability in WordPress Smart Slider 3 Plugin. This could allow a malicious actor to inject malicious scripts, such as redirects, advertisements, and other HTML payloads into your website which will be executed when guests visit your site. This vulnerability has been fixed in version 126.96.36.199.
Auth. PHP Object Injection vulnerability
PHP Object Injection vulnerability
Authenticated Stored CrossSite Scripting (XSS) vulnerability