Español
Deutsch
XSS attacks inject malicious scripts into a website that then run in the browser of anyone who visits the affected page.
How It Happens
If a website displays user-submitted content (like a comment) without properly sanitizing it, an attacker can submit code disguised as regular content, which then executes for every subsequent visitor.
What It Can Do
A successful XSS attack can steal session cookies, redirect visitors to malicious sites, or capture information entered into forms on the page.
Preventing It
Properly escaping and sanitizing any user-submitted content before displaying it, and using modern framework features that escape output by default, prevent the vast majority of XSS vulnerabilities.
