The Taeggie Feed plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'taeggie-feed' shortcode in all versions up to, and including, 0.1.9 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/taeggie-feed/
https://plugins.trac.wordpress.org/browser/taeggie-feed/trunk/taeggie_feed.php#L40