



When should JavaScript encoding be used?
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what is reflected xss Informational
- Regular expressions should be used for validation, not for sanitization.
- When serving user-uploaded content, ensure it's served with appropriate `Content-Type` headers that prevent it from being interpreted as executable code if that's not intended.
- What are the different types of XSS?
- Thinking that reflected XSS is less severe than stored XSS.
- Using blacklists instead of whitelists for input validation. What are the real-world examples of reflected XSS attacks?
- Always encode user input before including it in these contexts. How can reflected XSS be used to bypass two-factor authentication (2FA)?
- How can developers reproduce and fix reported reflected XSS vulnerabilities? What are the challenges in fixing reflected XSS vulnerabilities in legacy applications?
- Follow the same principles of input validation and context-aware output encoding as with traditional web development.
- What are HTTP headers as injection points for reflected XSS? Can custom HTTP headers be vulnerable to reflected XSS?
- JavaScript code injected via XSS can make requests to other hosts or ports, effectively performing a basic port scan from the user's machine.
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