Display Pages Shortcode <= 1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting

The Display Pages Shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'column_count' parameter in the [display-pages] shortcode in all versions up to, and including, 1.1. This is 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.