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Reflected Cross-Site Scripting (RXSS) is a type of web security vulnerability where malicious scripts are injected into a website and executed in the victim’s browser. This occurs when user-supplied input is improperly validated or sanitized by the server and then reflected back in the response. Attackers exploit this to steal sensitive data, hijack sessions, or deface websites.
You Should Know:
1. Identifying RXSS Vulnerabilities
To test for RXSS, inject payloads into input fields, URL parameters, or headers:
<script>alert('XSS')</script>
">
<
svg/onload=alert('XSS')>
Use tools like Burp Suite or OWASP ZAP to automate detection.
#### **2. Exploiting RXSS**
Example of a vulnerable URL:
[/html]
http://example.com/search?query=
If the script executes, the site is vulnerable. <ol> <li>Mitigation Techniques </li> </ol> - Input Sanitization: Use libraries like `DOMPurify` (JavaScript) or `htmlspecialchars()` (PHP). [php] echo htmlspecialchars($_GET['input'], ENT_QUOTES, 'UTF-8');
– Content Security Policy (CSP): Restrict script execution sources.
Content-Security-Policy: default-src 'self'; script-src 'unsafe-inline'
– HTTP-only Cookies: Prevent session theft via `HttpOnly` flag.
Set-Cookie: sessionID=123; HttpOnly; Secure
#### **4. Practice Commands**
- Linux Command to Test Payloads:
curl -G "http://example.com/search" --data-urlencode "query=<script>alert(1)</script>"
- Windows PowerShell Check:
Invoke-WebRequest -Uri "http://example.com/search?query=<script>alert(1)</script>"
### **What Undercode Say**
RXSS remains a critical threat due to poor input handling. Always validate, sanitize, and encode user inputs. Implement CSP and secure headers. Test with automated scanners and manual payloads.
### **Expected Output:**
- Vulnerable URL execution confirmation.
- Sanitized output in HTTP responses.
- CSP headers blocking unauthorized scripts.
(No additional URLs extracted from the original post.)
References:
Reported By: Thiago Marques – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
