Is Your Shopify Store Secure? The Security Checks You're Missing

Shopify Is Secure. Your Store Might Not Be.

This is the distinction that catches a lot of Shopify merchants off guard.

Shopify as a platform is heavily hardened. Their infrastructure, their payment processing, their core checkout flow — all of that is maintained by a dedicated security team with enterprise-grade controls. Shopify's responsibility ends at the platform level.

Your responsibility begins at the storefront.

The apps you install, the custom theme code you or an agency wrote, the third-party scripts loaded on your pages, the subdomain you set up and forgot about — none of that is Shopify's problem. All of it is yours.

This article breaks down exactly where Shopify stores are vulnerable and what you should be checking.

What Shopify Handles vs What You're Responsible For

Understanding this split is essential before you can assess your own risk.

**Shopify handles:** - PCI DSS compliance for payment processing - Core platform infrastructure security - Shopify admin authentication and session management - Database security at the platform level - DDoS protection via Cloudflare at the network layer

**You are responsible for:** - Every app you install and its permissions - Your theme code — including any custom JavaScript - Third-party scripts loaded on your storefront (analytics, chat widgets, marketing tools) - Your custom domain configuration - Email authentication records (SPF, DMARC) for your domain - Any subdomains you've created - Your Shopify admin password strength and MFA settings - Data you export or store outside Shopify

The moment you install an app or add a line of custom code, you've taken on responsibility for that security surface.

The Most Common Security Issues Found in Shopify Stores

1. Missing Security Headers on Custom Domains

When you connect a custom domain to Shopify, some security headers are controlled at the Shopify level — but not all. Referrer-Policy and Permissions-Policy are frequently missing, which can expose customer data to third-party analytics tools and allow unnecessary browser feature access.

A security scan of your custom domain will surface any headers that are absent or misconfigured.

2. GraphQL API Introspection Exposure

Shopify's Storefront API uses GraphQL, and introspection is often enabled — meaning anyone can query `/api/graphql` to map the full schema of your API. While introspection alone isn't a confirmed vulnerability, it hands attackers a detailed blueprint of your API structure, reducing the effort required to probe for weaknesses.

3. Subdomain Exposure and Forgotten Subdomains

Many merchants set up subdomains over time — `email.yourdomain.co.uk`, `app.yourdomain.co.uk`, `staging.yourdomain.co.uk` — and forget about them. If a subdomain points to a cloud service you've since cancelled, it may be vulnerable to subdomain takeover: an attacker could register the same service and serve malicious content under your domain.

4. Third-Party Script Injection Risk

Every marketing pixel, chat widget, and analytics tool you add to your store loads JavaScript in your customers' browsers. If any of those third-party services is compromised, that malicious JavaScript runs on your storefront — a form of attack known as a supply chain attack or Magecart-style attack.

While you can't fully eliminate this risk, you can audit which scripts are loading and ensure your Content Security Policy is configured to restrict what can execute on your pages.

5. Email Spoofing (Missing SPF and DMARC)

If your domain's SPF and DMARC records are weak or absent, attackers can send emails that appear to come from your domain. Your customers receive what looks like a legitimate order confirmation or account email — but it's phishing. This is a direct reputational and legal risk.

6. Reflected XSS in Search Parameters

Shopify's core search is well-protected, but themes with custom search implementations sometimes reflect user input back into the page without proper encoding. A reflected XSS vulnerability in your search parameter allows an attacker to craft a malicious URL that executes JavaScript in your visitor's browser when clicked.

7. Weak Admin Authentication

Shopify admin is protected by Shopify's own authentication, but the strength of that protection depends on your configuration. If MFA isn't enforced, if staff accounts have broader permissions than necessary, or if the admin URL is on a predictable path — these all increase the risk of unauthorised access.

What a Shopify Security Scan Covers

A proper security scan of a Shopify store is aware of the platform context. It knows which findings are Shopify-controlled infrastructure (and flags them as such) versus findings on the merchant-controlled layer.

A good scan will test your custom domain's security headers, check your GraphQL endpoint configuration, enumerate and verify your subdomains, detect email authentication weaknesses, test for XSS vulnerabilities in storefront parameters, check for clickjacking protection, analyse your SSL/TLS configuration, identify exposed ports on your infrastructure, and flag any information disclosure risks.

It will **not** misclassify Shopify infrastructure issues as your vulnerabilities — that distinction matters for understanding what you can actually fix.

What to Do After a Scan

A scan gives you a prioritised list. Here's how to approach remediation as a Shopify merchant:

**Critical/High findings:** Get your developer involved immediately. XSS vulnerabilities in your storefront, subdomain takeover conditions, and missing DMARC records with active spoofing risk need urgent attention.

**Medium findings:** Schedule these for your next development sprint. GraphQL introspection, missing security headers, and exposed alternative ports fall here.

**Low/Informational:** Review these and address where practical. Many will be observations about Shopify-controlled infrastructure you can't change.

Protect Your Store

Shopify provides the secure foundation. What you build on top of it — your theme, your apps, your domain, your subdomains — is your security responsibility.

A scan takes minutes. The report tells you exactly where you stand.

[Scan your Shopify store at yrzoai.dev →](https://yrzoai.dev)

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*Yrzo AI automatically detects Shopify-hosted stores and adjusts testing accordingly, distinguishing between platform-controlled and merchant-controlled security findings.*