The Side Slide Responsive Menu plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
https://wordpress.org/plugins/side-slide-responsive-menu/
https://plugins.trac.wordpress.org/browser/side-slide-responsive-menu/tags/1.0/sideslide_admin.php