Vulnerability warning by iThemes Security (and possible by other security scanners)
iThemes Security and some other security scanners has started to write out these kind of warnings:
Smart Slider 3 < 18.104.22.168 - Authenticated Stored Cross-Site Scripting (XSS)
You can add access to Smart Slider to non-admin users as well. For example, you can allow your editor role users to create or modify your sliders and slides.
Ultimately, before giving access to Smart Slider to any user on your site, you should be aware of the options Smart Slider offers, to know what kind of access you just gave them.