The Gutenverse WordPress plugin before 1.9.1 does not validate the htmlTag option in various of its block before outputting it 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
https://wpscan.com/vulnerability/6f100f85-3a76-44be-8092-06eb8595b0c9/