TemplatesNext ToolKit < 3.2.8 - Contributor+ Stored XSS via Shortcode

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.

PoC

[tx_heading margin=‘" onmouseover=“alert(/XSS/)”’]