Elementor Pro <=4.2.1 - Unauthenticated Arbitrary File Upload via Form Handler

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Elementor Pro plugin for WordPress in versions <=4.2.1 is vulnerable to unauthenticated arbitrary file upload in the Forms module File Upload field. The validation() and process_field() methods iterate over submitted file entries with different early-exit logic for UPLOAD_ERR_NO_FILE entries. When an attacker submits two file parts for the same upload field — an empty first entry (blank filename triggering UPLOAD_ERR_NO_FILE) followed by a payload — validation() returns early after the empty entry without ever type-checking the payload, while process_field() only skips (continue) the empty entry and moves the payload to wp-content/uploads/elementor/forms/. The AJAX action elementor_pro_forms_send_form requires no authentication or nonce.

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