An XSS attack (Cross-Site Scripting) is a type of security vulnerability where an attacker injects malicious JavaScript code into a web page that other users then view. When the victim’s browser loads the page, the injected script runs and can steal cookies, hijack sessions, redirect users, or deface the page.
How XSS Works
Imagine a comment form on a WordPress blog that doesn’t properly sanitize input. An attacker submits a comment containing JavaScript code instead of plain text. If the site displays that comment without cleaning it up first, every visitor who views the comment page runs that malicious script in their browser.
Types of XSS
- Stored XSS: Malicious script is saved to the database and served to every visitor
- Reflected XSS: Script is embedded in a URL and only runs when the victim clicks the crafted link
- DOM-based XSS: The attack happens in the browser without the server being involved
Protecting Your WordPress Site
- Keep WordPress core, themes, and plugins updated
- Use a security plugin like Wordfence or Sucuri
- Enable a Web Application Firewall (WAF) to filter malicious requests
- Developers should sanitize all user inputs and escape all outputs
Related: WordPress Security
