XSS – Cross-Site Scripting is a type of security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. These scripts can steal sensitive information, manipulate content, or hijack user sessions, often without the user realising it.
Here’s a simple breakdown:
- Malicious Script Injection: In an XSS attack, an attacker embeds harmful JavaScript or other scripts into a web page or input form. When a victim loads the page, the script runs in their browser, potentially compromising their data.
- Types of XSS Attacks:
- Stored XSS: The malicious script is permanently stored on the server, often in a database, and is executed whenever a user accesses the affected page.
- Reflected XSS: The malicious script is reflected off the server, typically through an URL or query parameter, and executed immediately when a user clicks a crafted link.
- DOM-based XSS: The attack occurs when the malicious script manipulates the Document Object Model (DOM) in the victim’s browser, often through client-side code.
- Consequences: XSS can allow attackers to steal session cookies, deface websites, redirect users to malicious sites, or inject malware, which can have serious implications for both the user and the website.
Why Use XSS Protection? XSS protection is essential to prevent attackers from exploiting vulnerabilities in web applications, ensuring that users’ data, sessions, and interactions remain secure.
Think of XSS like someone sneaking a harmful message into a letter you’re about to send. When others read the letter (or load the web page), they are tricked into executing the harmful message or script, potentially causing damage without their knowledge.
