WP Recipe Maker <= 9.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via header_tag

The WP Recipe Maker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in all versions up to, and including, 9.1.0 due to unrestricted use of the 'header_tag' attribute. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.