Chapter-21, LEC-2 | What is XSS | #rumble#ethicalhacking #education

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Cross-site scripting (XSS) is a type of security vulnerability that can occur in web applications. It involves an attacker injecting malicious code, usually in the form of a script, into a web page viewed by other users. The malicious code can then be executed by the user's browser, leading to a range of potentially harmful consequences.

XSS attacks can be classified into three main types: stored XSS, reflected XSS, and DOM-based XSS. Stored XSS occurs when the malicious script is stored on the server and retrieved each time a user requests the compromised web page. Reflected XSS, on the other hand, involves the attacker sending a link that contains the malicious script to the victim, who then inadvertently executes the script. Finally, DOM-based XSS attacks manipulate the Document Object Model (DOM) of a web page to execute the malicious code.

The consequences of an XSS attack can range from a simple annoyance, such as pop-up ads, to serious security breaches, such as stealing sensitive information, taking over user accounts, or distributing malware. Web developers can prevent XSS attacks by properly validating and sanitizing user input, using secure coding practices, and implementing various security measures such as Content Security Policy (CSP) and Input Validation Filters. Regular security audits and updates to software and libraries can also help prevent XSS vulnerabilities.