What is a Javascript Injection Attack and How is it Orchestrated?

【Javascript Injection】Definition, Examples, and Prevention

Oct 4, 2022

8 min read

Sudip Sengupta

In this article:

An injection vulnerability allows a malicious actor to inject harmful code into a system through another application. Hackers typically use injection attacks to access the backend server configuration, shell commands, or OS calls when the application fails to validate user input adequately. Since the web application accepts untrusted user data as part of a query or command, injection attacks allow for arbitrary dynamic code execution and user session hijacking.

This article discusses how attackers perform JavaScript injections to manipulate web pages and alter resource parameters while learning measures to prevent such attacks.

What is a JavaScript Injection Attack?

In a JavaScript injection attack, an attacker injects malicious code into the client-side JavaScript directly. This code launches and renders when the victim loads the website with the malicious script in their client application/browser. An attacker may rely on various techniques to enter malicious code into a vulnerable site, including:

Using the browser’s developer console to insert JavaScript or change the source codeAdding a script by entering JavaScript: SCRIPT element to the client’s address barUsing cross-site scripting to add scripts into a comment or input form field 

An exploit script is designed to perform several actions depending on the exact content type. Malicious exploits through JavaScript injection code include:

Obtaining sensitive

Read more

Explore the site

More from the blog

Latest News