A canonicalization attack is a cyberattack method in which the attacker substitutes various inputs for the canonical name of a path or file. Typically exploited by entering the file path in an input field or webpage or part of a URL, canonical attacks enable attackers to access unauthorized files and directories on a web server. One method of a canonicalization attack is when an attacker encodes input before it is sent to the application for further processing, enabling the attacker to evade a system’s input validation and output encoding controls.
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