HTTP Request Smuggling (HRS)

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HTTP Request Smuggling, also known as HTTP Desync Attacks, is an attack technique for interfering with the way a website processes sequences of HTTP requests that are received from one or more users. It allows the attacker to "smuggle" a request to a web server without the devices between the attacker and the web server being aware of it. HTTP request smuggling vulnerabilities are often critical in nature, allowing an attacker to bypass security controls, interfere with other user sessions, gain unauthorized access to sensitive data and directly compromise other application users.