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Cross-Site Scripting (XSS) remains one of the most prevalent web vulnerabilities, allowing attackers to inject malicious scripts into web pages viewed by other users. Event handlers in HTML and JavaScript can be exploited to trigger XSS attacks. Below are 20 event handlers that attackers may use to execute malicious payloads:
1. `onload`
2. `onerror`
3. `onclick`
4. `onmouseover`
5. `onmouseout`
6. `onfocus`
7. `onblur`
8. `onsubmit`
9. `onreset`
10. `onselect`
11. `onchange`
12. `onkeydown`
13. `onkeypress`
14. `onkeyup`
15. `ondblclick`
16. `onmousedown`
17. `onmouseup`
18. `oncontextmenu`
19. `onwheel`
20. `onbeforeunload`
You Should Know:
To test and mitigate XSS vulnerabilities, use the following commands and techniques:
Testing for XSS (Manual Approach)
<script>alert('XSS')</script>
<img src="x" onerror="alert('XSS')">
<a href="javascript:alert('XSS')">Click</a>
Automated XSS Scanning with Tools
1. Using OWASP ZAP
zap-cli quick-scan --spider -r http://example.com
2. Using Burp Suite
- Intercept requests and modify parameters with XSS payloads.
3. Using XSS Hunter
python3 xsshunter.py --payloads xss_payloads.txt
Mitigation Techniques
1. Input Sanitization (PHP Example)
$clean_input = htmlspecialchars($_GET['input'], ENT_QUOTES, 'UTF-8');
2. Content Security Policy (CSP) Header
Content-Security-Policy: default-src 'self'; script-src 'unsafe-inline' 'unsafe-eval';
3. Using HTTP-only Cookies
Set-Cookie: sessionid=123; HttpOnly; Secure
Linux Command for Log Analysis (Detecting XSS Attempts)
grep -E "(<script>|onerror=|javascript:)" /var/log/nginx/access.log
Windows Command for Blocking Malicious Requests
Get-WinEvent -LogName "Microsoft-Windows-IIS-Logging/Operational" | Where-Object { $_.Message -like "<script>" }
What Undercode Say
XSS remains a critical threat due to improper input validation. Developers must enforce strict sanitization, use CSP headers, and conduct regular penetration testing. Attackers continuously evolve payloads, so security teams must stay updated with the latest exploitation techniques.
Prediction
As web applications grow more complex, XSS attacks will increasingly leverage AI-generated payloads to bypass traditional filters. Automated defense mechanisms powered by machine learning will become essential.
Expected Output:
- Course URLs:
– Social Media:
– Instagram
– Twitter
– Website
References:
Reported By: Zlatanh 20 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
