Canto <= 3.1.1 - Missing Authorization to Unauthenticated File Upload
The Canto plugin for WordPress is vulnerable to missing authorization in the copy-media.php upload flow. The file is directly accessible and accepts attacker-controlled parameters for the upload destination, allowing unauthenticated users to upload arbitrary files constrained to WordPress-allowed MIME types. The fbc_app_api parameter controls the domain WordPress fetches from via wp_safe_remote_get, enabling SSRF to attacker-controlled infrastructure.