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Learn something NEW about XSS! A Reflected XSS vulnerability can be exploited using a bookmark trick, allowing attackers to execute malicious scripts when a victim visits a specially crafted URL. This technique bypasses typical input validations by leveraging browser bookmark features.
Read the full article here: https://lnkd.in/dwX5whMC
You Should Know:
How to Test for Reflected XSS
- Identify Input Points: Check URL parameters, form fields, and HTTP headers.
2. Craft Malicious Payload:
<script>alert('XSS')</script>
3. Test via Bookmark:
- Save the malicious URL as a bookmark:
javascript:alert(document.cookie)
- Alternatively, use a URL-encoded payload:
https://example.com/search?q=%3Cscript%3Ealert(1)%3C/script%3E
Preventing Reflected XSS
- Input Sanitization:
function sanitize(input) { return input.replace(/<script.?>.?<\/script>/gi, ''); } - Content Security Policy (CSP):
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'unsafe-inline'">
- HTTP-only Cookies:
Set-Cookie: sessionID=123; HttpOnly; Secure
Linux Command for XSS Testing
Use `curl` to test URL parameters:
curl -G "https://example.com/search" --data-urlencode "q=<script>alert(1)</script>"
Windows PowerShell for XSS Payloads
Invoke-WebRequest -Uri "https://example.com/search?q=<script>alert('XSS')</script>"
What Undercode Say
Reflected XSS remains a critical web vulnerability, especially when combined with social engineering tricks like bookmark exploitation. Always sanitize user inputs, enforce strict CSP headers, and use secure coding practices. For penetration testers, automated tools like Burp Suite and OWASP ZAP can help detect XSS flaws efficiently.
Expected Output:
A secure web application that filters malicious scripts and prevents unauthorized JavaScript execution via URL parameters.
Related Links:
References:
Reported By: Activity 7319280106546339840 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
