The WP ULike plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugins wp_ulike shortcode in all versions up to, and including, 4.6.9 due to insufficient input sanitization and output escaping on the user supplied wrapper_class attribute. 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.