The Carousel, Slider, Gallery by WP Carousel WordPress plugin before 2.5.3 does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admins.

The Slider, Gallery, and Carousel by MetaSlider WordPress plugin before 3.27.9 does not sanitise and escape some of its Gallery Image parameters, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)

The Post Grid, Slider & Carousel Ultimate WordPress plugin before 1.5.0 does not sanitise and escape the Header Title, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed.