The AD Sliding FAQ plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'sliding_faq' shortcode in all versions up to, and including, 2.4 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://plugins.trac.wordpress.org/browser/ad-sliding-faq/trunk/any-sliding-faq.php#L205
https://plugins.trac.wordpress.org/browser/ad-sliding-faq/tags/2.4/any-sliding-faq.php#L205