Premium Addons for Elementor <= 4.11.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via Countdown Widget

The Premium Addons for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the data-countdown attribute of Countdown widget in all versions up to, and including, 4.11.8 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.