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This lesson focuses on the unrestricted upload of file with dangerous type. This means components exchange information and/or data via insecure means. When an unrestricted upload of file with dangerous type occurs, it is because of a result of coding which allows an attacker to upload or transfer harmful files (e.g. extensions and payloads). Participants also learn about possible attacks via malware, denial of service and web shell code. Finally, participants learn some HTML sample code.