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When a web application has two endpoints—one that requires password verification and another that doesn’t—attackers can bypass authentication by directly accessing the unprotected endpoint. This vulnerability occurs when backend logic fails to enforce consistent security checks.
You Should Know:
1. Identifying Unprotected Endpoints
Use Burp Suite or curl to probe endpoints:
curl -X POST http://example.com/api/delete-account curl -X POST http://example.com/api/secure/delete-account
Compare responses—if the first works without authentication, it’s vulnerable.
2. Exploiting with Burp Suite
- Intercept a request to the protected endpoint.
- Modify the path to the unprotected version.
- Forward the request and check for success.
3. Testing for Mass Assignment
Some APIs accept arbitrary parameters. Test with:
curl -X POST -d '{"admin":true}' http://example.com/api/profile/update
4. Automating with Python
import requests
url_unprotected = "http://example.com/api/delete-account"
response = requests.post(url_unprotected)
if response.status_code == 200:
print("Vulnerable: Account deleted without auth!")
5. Mitigation Techniques
- Enforce authentication middleware on all sensitive endpoints.
- Use role-based access control (RBAC).
- Log and monitor unauthorized access attempts.
6. Linux Command for Log Analysis
Check for suspicious API access:
grep "POST /api/delete-account" /var/log/nginx/access.log | grep -v "sessionid=valid"
7. Windows Command for Firewall Logs
Detect brute-force attempts:
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4625} | Where-Object { $_.Message -like "example.com" }
What Undercode Say
This flaw highlights poor backend validation. Always assume attackers will find and abuse unprotected endpoints. Implement consistent security checks, audit API routes, and use tools like OWASP ZAP for automated testing.
Expected Output:
- Vulnerable System: Account deletion without password.
- Secure System: 403 Forbidden on unauthorized access.
Prediction
As APIs grow, similar flaws will emerge in microservices architectures. Automated scanning for unprotected endpoints will become a standard pentest requirement.
URLs for further reading:
IT/Security Reporter URL:
Reported By: Sahil Kumar – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
