Menu Card <= 0.8.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

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.