The AI Feeds plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'aife_post_meta' shortcode in all versions up to, and including, 1.0.22 due to insufficient input sanitization and output escaping. 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://plugins.trac.wordpress.org/browser/ai-feeds/trunk/includes/functions.php#L58
https://plugins.trac.wordpress.org/browser/ai-feeds/tags/1.0.12/includes/functions.php#L58