The Menu Card plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `category` parameter in all versions up to, and including, 0.8.0 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.
https://plugins.trac.wordpress.org/browser/menu-card/trunk/menu-card.php#L102
https://plugins.trac.wordpress.org/browser/menu-card/tags/0.8.0/menu-card.php#L102