✅ Secure Cross-Site Scripting (XSS) Prevention
In this secure version, user comments are properly sanitized and rendered as plain text rather than HTML. This prevents any malicious HTML or JavaScript from being executed.
Key Protections:
- Comments are rendered as plain text, not HTML.
- JSX safely escapes user input, preventing script execution.
- Server/API sanitizes or avoids rendering dangerous HTML entirely.
🔍 How to Verify Secure Implementation
- Go to the Secure Comment Form: /secure/comment-form and try submitting a script like
<script>alert('XSS!')</script>
- It will be shown as plain text — no alert will trigger.
- View the admin panel: /secure/admin to confirm safe rendering of all comments.
- Compare with vulnerable version: /vulnerable/comment-form — the same payload will trigger an alert popup.
- Reset with "Delete All Comments": to test again from a clean slate.
- Inspect API Response: All comments are returned as plain, encoded text with no HTML tags.
✅ This secure setup ensures that all user input is treated as text, neutralizing XSS attacks completely.