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

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Jegstudio Gutenverse allows Stored XSS.This issue affects Gutenverse: from n/a through 1.9.2.

The Gutenverse – Ultimate Block Addons and Page Builder for Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's countdown Block in all versions up to, and including, 2.2.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Gutenverse News plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘elementId’ parameter in all versions up to, and including, 1.0.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.