XSS Scanner

Cross-site scripting (XSS) is the most prevalent web vulnerability, affecting an estimated 65% of all web applications. It allows attackers to inject malicious scripts into web pages viewed by other users.

Types of XSS We Detect

• Reflected XSS — Malicious script is reflected off a web server in error messages, search results, or other responses
• Stored XSS — The script is permanently stored on the target server (database, forum, comments)
• DOM-Based XSS — The vulnerability exists in client-side JavaScript code rather than server-side

XSS Attack Impact

• Session hijacking — Steal user login cookies
• Account takeover — Change passwords, email addresses
• Keylogging — Record everything a user types
• Phishing — Display fake login forms on legitimate sites
• Malware distribution — Redirect users to malicious downloads

What is cross-site scripting (XSS)?

XSS is a vulnerability that allows attackers to inject malicious JavaScript into web pages. When other users load the page, the script executes in their browser, potentially stealing cookies, session tokens, or performing actions on their behalf.

How do I prevent XSS?

Encode all user output (HTML entity encoding), validate input on the server side, use Content-Security-Policy headers, and implement HttpOnly cookies to prevent session hijacking.

Is XSS dangerous?

Very. XSS can lead to complete account takeover, data theft, and malware distribution. It's ranked #7 on the OWASP Top 10 and is the most commonly found vulnerability in web applications.

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