XSS Payload Generator - Security Testing Tool
Generate cross-site scripting (XSS) test payloads for security testing and education. Test your web applications for XSS vulnerabilities. For authorized testing only.
Educational Purpose Only
This tool is for security testing and education only. Only test on applications you own or have explicit permission to test. Unauthorized testing is illegal.
Generate XSS Payloads
XSS Prevention
- • Always encode/escape user input before rendering
- • Use Content Security Policy (CSP) headers
- • Validate and sanitize all input
- • Use modern frameworks with built-in XSS protection
- • Never insert untrusted data into dangerous contexts
What is XSS (Cross-Site Scripting)?
Cross-Site Scripting (XSS) is a security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. XSS attacks can steal cookies, session tokens, or other sensitive information, and can even rewrite the content of the HTML page.
Types of XSS
Reflected XSS
Malicious script comes from the current HTTP request. The attack is reflected off the web server.
Stored XSS
Malicious script is permanently stored on the target server (database, message forum, etc.).
DOM-based XSS
The vulnerability exists in client-side code rather than server-side code.
XSS Prevention Best Practices
- Input Validation: Validate all user input on the server side
- Output Encoding: Encode data before rendering in HTML, JavaScript, CSS, or URLs
- Content Security Policy: Implement CSP headers to restrict script execution
- HTTPOnly Cookies: Mark cookies as HTTPOnly to prevent JavaScript access
- Framework Protection: Use modern frameworks with built-in XSS protection
- Sanitization Libraries: Use trusted libraries like DOMPurify for HTML sanitization
Legal and Ethical Considerations
Important: Only test applications you own or have explicit written permission to test.
Unauthorized security testing is illegal and can result in criminal charges. This tool is provided for educational purposes and authorized security testing only.