DIV XSS

WHAT IS DIV XSS?

Div-based XSS (Cross-Site Scripting) refers to a type of XSS attack where malicious scripts are injected into a <div> element or similar HTML containers on a webpage. This typically happens when user input is not properly sanitized before being inserted into the DOM.

HOW DOES DIV XSS WORK?

Vulnerability: Attackers find weaknesses in websites (e.g., forms, comments) that allow code injection.

Injection: Malicious scripts (often JavaScript) are inserted into the vulnerable area.

Execution: When a user visits the compromised page, their browser runs the injected script.

Impact: Scripts can steal data (cookies), hijack accounts, redirect users, or deface websites.

MITIGATION FOR DIV XSS:

Escape Output → Convert < to <, > to >, etc.

Use textContent → Avoid innerHTML when inserting user input.

Implement CSP → Block inline scripts and restrict script sources.

Server-Side Validation → Sanitize input before storing/displaying.

CONCLUSION:

DIV-based XSS occurs when untrusted user input is inserted into a <div> without proper sanitization, allowing attackers to execute malicious scripts. To prevent this, always escape output, use textContent instead of innerHTML, sanitize input with tools like DOMPurify, enforce a strong Content Security Policy (CSP), and validate input on both client and server sides.By implementing these security measures, you can effectively mitigate the risk of XSS attacks and protect your users from potential threats.