Countdown Timer for Elementor <= 1.3.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'countdown_label'

The Countdown Timer for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'countdown_label' Parameter in all versions up to, and including, 1.3.9 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.