Page Builder by SiteOrigin < 2.29.16 - Contributor+ Stored XSS via siteorigin_widget Shortcode

Description

The plugin is vulnerable to Stored Cross-Site Scripting via the plugin's 'siteorigin_widget' shortcode 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.