javascript injection tutorial

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javascript injection, also known as cross-site scripting (xss), is a common security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. these scripts can steal sensitive information, modify page content, or perform other malicious actions.

to demonstrate a basic example of javascript injection, let's consider a simple web page with a form field where users can input their name. we will inject a script that alerts "hello, i am an attacker!" when the page is loaded.

here is the html code for the vulnerable web page:



in the above code snippet, the javascript part is vulnerable to injection because it directly outputs the value of the `name` parameter from the url without proper validation or encoding. an attacker can exploit this vulnerability by sending a crafted url with a malicious script as the `name` parameter.

here is an example of a crafted url that triggers the javascript injection:



when a user visits the above url, the injected script will be executed, and an alert box saying "hello, i am an attacker!" will be displayed.

to prevent javascript injection, always validate and sanitize user input before using it in your javascript code. additionally, consider using content security policy (csp) headers to mitigate the risk of xss attacks by restricting the sources from which scripts can be loaded.

it's essential to follow secure coding practices to protect your web applications from such vulnerabilities and ensure the safety of your users' data.

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