Ultimate Carousel For WPBakery Page Builder <= 2.6 - Contributor+ Stored XSS

The plugin does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks. The plugin author was made aware of this vulnerability on Jan 13, 2023.

PoC

Exploit shortcode: [na_posts_carousel slide_visible_mbl=‘" onmouseover=“alert(1)” style=“background:red;”’]