Spotlight Social Feeds < 1.4.3 - Contributor+ Stored XSS

The plugin does not validate and escape some of its block options before outputting them back in a page/post where the block is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks

PoC

Exploit Additional CSS class(es) for “Spotlight Instagram Feed” Gutenberg block: " onmouseover=“alert(1)” style=“background:red;” Note: First, you need to add a Feed with an Instagram account connection.