Unlimited Elements For Elementor <= 2.0.7 - Authenticated (Contributor+) SQL Injection via 'filter_search' Parameter

The Unlimited Elements for Elementor plugin for WordPress is vulnerable to SQL Injection via the 'data[filter_search]' parameter in the get_cat_addons AJAX action in versions up to and including 2.0.7. This is due to insufficient input sanitization and the use of deprecated escaping functions combined with direct string concatenation in SQL query construction. The vulnerability is exacerbated because the normalizeAjaxInputData() function calls stripslashes() on all user input, removing the protection provided by WordPress's wp_magic_quotes() function. Subsequently, the filter_search parameter is escaped using the deprecated wpdb->_escape() function and then directly concatenated into a LIKE clause without using prepared statements. This makes it possible for authenticated attackers, with Contributor-level access and above (who can obtain a valid nonce through the Elementor editor), to inject arbitrary SQL commands and extract sensitive information from the database.