XSS Attacks

User-provided data, such as URL parameters, POST data payloads, or cookies, should always be considered untrusted and tainted. Furthermore, when processing an HTTP request, a web server may copy user-provided data into the body of the HTTP response that is sent back to the user. This behavior is called a “reflection”. Endpoints reflecting tainted data could allow attackers to inject code that would eventually be executed in the user’s browser. This could enable a wide range of serious attacks like accessing/modifying sensitive information or impersonating other users

Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted websites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur anywhere a web application uses input from a user within the output it generates without validating or encoding it

Types of XSS

Reflected XSS

Stored XSS


These videos explain the impact of vulnerability and exploitation








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