What are some examples of XSS vulnerabilities in React?

What are some examples of XSS vulnerabilities in React?

XSS, or Cross-Site Scripting, can occur in React applications if user input is not properly sanitized. For example, if you use dangerouslySetInnerHTML without sanitizing the input, it can lead to XSS attacks.

Can you give me a specific code example?

Sure! Here's a simple example:

const userInput = '<img src=x onerror=alert(1)>';
const unsafeHTML = <div dangerouslySetInnerHTML={{ __html: userInput }} />;

In this case, the onerror event can execute JavaScript, leading to an XSS vulnerability.

How can I prevent XSS in my React app?

To prevent XSS, avoid using dangerouslySetInnerHTML unless absolutely necessary. Always sanitize user inputs using libraries like DOMPurify before rendering them.

Are there any libraries that can help with sanitization?

Yes, libraries like DOMPurify and sanitize-html are popular choices for sanitizing HTML in React applications.