The Searchie plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'sio_embed_media' shortcode in all versions up to, and including, 1.17.0 due to insufficient input sanitization and output escaping on user supplied attributes. 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://wordpress.org/plugins/searchie/
https://plugins.trac.wordpress.org/browser/searchie/trunk/SIO/Shortcodes/WidgetsEmbed.php