Penetration Testing for UK Retail and E-commerce
CREST-accredited penetration testing for UK online retailers, D2C brands, omnichannel retailers and digital-commerce platforms. Storefronts, checkouts, merchant admin, loyalty apps and returns portals: price and voucher logic, checkout integrity, payment redirects, returns fraud, customer accounts and third-party scripts. Fixed quote in 24 hours.
- Unlimited retesting
- Unlimited pre-retesting
- No hidden fees
“I would highly recommend EJN Labs to any organisation seeking reliable, detailed, and well-managed penetration testing services, particularly for government or enterprise-level projects.”
“There wasn’t another company we could find that could deliver what we needed in the timeframe we needed. The client loved it, and we got instant ROI from the engagement.”
commerce platforms we scope separately (Shopify, WooCommerce, Magento/Adobe Commerce, BigCommerce, commercetools and Salesforce Commerce Cloud), because what changes between them is your configuration, not the platform.
Where Retail and E-commerce Businesses Actually Lose Money
Business logic, not just OWASP Top 10. Online retail, D2C and omnichannel businesses lose money through business logic as often as through missing patches: price and voucher-code manipulation, checkout integrity and payment redirects, returns fraud, customer-account takeover, and third-party scripts running unchecked on checkout and account pages. We test every one of these paths alongside the standard web application surface.
Your platform, scoped correctly. We test Shopify custom apps, Hydrogen storefronts and checkout extensions, WooCommerce plugins and REST endpoints, and Magento / Adobe Commerce extensions and GraphQL storefronts, alongside BigCommerce, commercetools and Salesforce Commerce Cloud implementations. What we test is your store configuration, theme, custom apps and extensions, integrations and APIs, never the platform vendor’s own infrastructure.
PCI DSS. If you store, process or transmit cardholder data, PCI DSS 4.0.1 Requirement 11.4.3 requires external penetration testing at least once every 12 months and after significant change, and Requirement 11.4.2 requires the same internally; Requirement 11.4.5 adds segmentation testing where segmentation isolates your cardholder data environment. Requirement 11.6.1 separately requires payment-page tamper and change detection at least weekly, which is exactly where third-party checkout scripts sit. See our PCI DSS penetration testing page. PCI Security Standards Council.
Who we test for. Online retailers, D2C brands, omnichannel and digital-commerce businesses, B2B wholesale portals, subscription and membership commerce, and marketplace sellers. See our e-commerce penetration testing guide for the full methodology, our checkout and payment flow page for cart-level detail, and our online marketplace page if you run a multi-vendor platform.
SCOPE
What We Test for UK Retail and E-commerce
Storefront & Product Catalogue
Browsing, search and category pages, promotions and price or voucher-code logic, user accounts, and the third-party scripts (tag managers, chat widgets, personalisation and review tools) that run on customer-facing pages.
Checkout & Payment Flow
Cart and checkout journeys, price and currency integrity, payment redirects and callbacks, discount-code abuse, guest checkout, and which scripts are allowed to run on the payment page.
Merchant & Store Admin
Back-office and store-admin panels, staff roles, inventory and pricing controls, bulk-discount tools, and separation between store-level staff and platform-level administrators.
B2B & Wholesale Ordering
Trade and wholesale ordering portals, customer-specific catalogues and pricing, credit limits, company hierarchies, and approval chains between buyer roles.
Loyalty, Gift Cards & Subscriptions
Points and rewards balances, gift-card and voucher redemption, referral schemes, and subscription commerce: plan changes, proration, renewal and cancellation logic.
Orders, Returns & Customer Accounts
Order-management and returns platforms, refund-recipient and shipping-address changes, return-authorisation logic, and customer-account takeover across saved cards, addresses and order history.
Commerce & POS APIs
Storefront, payment and point-of-sale integration APIs. OWASP API Top 10, object-level authorisation, and webhook signature and replay checks across checkout, fulfilment and in-store systems.
Cloud & Peak-Trading Infrastructure
AWS, Azure and GCP configuration behind the storefront, CDN and autoscaling configuration, and infrastructure resilience under seasonal peak-trading load.
Customer & Staff Phishing Defence
Targeted phishing simulation against contact-centre and fulfilment staff, plus lookalike-domain and brand-impersonation scenarios used against your customers around sales events and returns.
OUR PROCESS
From Scope to Attestation in 4-6 Weeks
Scoping Call
30-minute technical scoping call to map your storefront, checkout, merchant admin, integrations and platform (Shopify, WooCommerce, Magento/Adobe Commerce, BigCommerce or your own build). Fixed-price quote within 24 hours.
Test Environment
You provide a staging store, or a production testing window that avoids peak trading (sale events, seasonal launches), with test accounts for customer, merchant-admin and any B2B or loyalty roles.
Active Testing
3-15 days of hands-on testing by CREST-certified pen testers across storefront, checkout, admin, APIs and integrations. Daily status updates and live findings in your client portal.
Report & Retest
CVSS-scored report with reproduction steps and remediation, a 60-minute walkthrough call, free retest, and a letter of attestation for PCI DSS evidence, auditors or your own board.
CREDENTIALS
Verified Accreditations Auditors Accept
Every credential below is independently verifiable. UK procurement teams, FCA supervisors, ISO 27001 / SOC 2 auditors, and cyber insurance underwriters all recognise these standards.
GET YOUR QUOTE
Get a CREST retail and e-commerce pen test quote in 24 hours
A fixed-price quote back in one business day, from a named CREST assessor. No sales pipeline, no chasing.
- CREST and IASME accredited. Testing your auditors and clients already recognise.
- Fast-track testing within 24 hours where required. Free retest of every fix included.
- Live findings via your client portal, not a four-week PDF.
- Fixed price from £3,500 for a single-role, single-app scope, agreed up front. Most engagements run £5,000 and up. No day-rate surprises.
Dan WilcocksonFounder, CelloriUnder NDA Further named references available on a scoping call.
- We reply within one business day with a fixed-price quote from a named CREST assessor.
- You approve the scope and we book a start date, usually within 24 hours.
- Live findings land in your client portal as we test, with a free retest of every fix.
Get your fixed pen test quote in 24 hours
Quote request received
We will reply within one business day with your fixed-price quote from a named CREST assessor.
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or book a 20-min scoping call first
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COMPLIANCE READY
Reports Aligned to Every Framework
Findings map to specific control references in each framework, so your audit team submits the report directly without translation work.
PCI DSS 4.0.1
External and internal penetration testing under Requirements 11.4.2-11.4.3, plus 11.6.1 payment-page tamper detection.
UK GDPR
Article 32(1)(d) evidence that you regularly test the effectiveness of your security measures.
ISO 27001
Annex A 8.8 technical vulnerability management, once you declare that control applicable.
Cyber Insurance
Findings and remediation documented against the questions on your proposal form. Requirements vary by insurer and policy.
OWASP ASVS
Access-control and business-logic findings mapped to the Application Security Verification Standard.
OWASP API Top 10
API findings mapped to their API Security Top 10 category across payment, POS and marketplace integrations.
PRICING
Indicative Engagement Pricing
Fixed-price quotes confirmed during scoping. Free retest, executive summary, walkthrough call, and letter of attestation included.
Depends on service + scope
External / web / API / mobile single-target engagement. CREST-certified delivery. Around 3 to 5 working days from kickoff to report.
Get a fixed quoteDepends on service + scope
Multi-target combined engagement (web + API + external + AD), or single complex target. Typically 7-10 days.
Get a fixed quoteDepends on service + scope
Full-stack engagement (multiple cloud accounts, hybrid AD, complex web + API + mobile). Typically 12-15+ days.
Get a fixed quoteWHY EJN LABS
What You Get From Retail and E-commerce Penetration Testing
Six concrete differentiators competitors don’t all match.
CREST-Certified Testers, Verifiable
Every test by a CREST-certified pen tester (CRT, CCT APP, CCT INF where applicable). Verify our company status at crest-approved.org.
24-Hour Startup, Where Required
From signed scope to active testing in a single business day for incident response, audit deadlines, or regulator-driven timelines.
Live Findings, Not 4-Week PDFs
Critical issues reported during testing through your client portal. Your team remediates while testing continues.
Audit-Ready Reports
Executive summary plus full technical report with CVSS scores and explicit framework mappings (ISO 27001, SOC 2, PCI DSS, FCA SYSC).
Free Retests, Standard
Verify remediation of every finding before close-out. Letter of attestation for audit submission included. Most competitors charge £1,500-£3,000 per retest.
UK-Based CREST Testers
Every engagement performed by vetted, UK-based CREST-certified testers, matched to your needs, security clearance, and compliance scope.
FAQ
Frequently Asked
Can you test our Shopify checkout before a retailer launches?
Yes. We test Shopify custom apps, Hydrogen storefronts and checkout extensions against your specific configuration: cart and checkout logic, price and discount-code handling, and the third-party scripts allowed to run on the payment page. See our Shopify penetration testing page. We test your store, theme, apps and integrations, not Shopify’s own infrastructure.
Do you test WooCommerce and Magento / Adobe Commerce stores?
Yes. WooCommerce plugin permissions and REST endpoints, and Magento / Adobe Commerce extensions and GraphQL storefronts. We also test BigCommerce, commercetools and Salesforce Commerce Cloud implementations, always scoped to your configuration and integrations rather than the platform vendor’s infrastructure.
What does PCI DSS actually require from us?
PCI DSS 4.0.1 Requirement 11.4.3 requires external penetration testing at least once every 12 months and after significant change, and Requirement 11.4.2 requires the same internally. Requirement 11.4.5 adds segmentation testing where segmentation isolates your cardholder data environment, and Requirement 11.6.1 requires payment-page tamper and change detection at least weekly. We scope testing to the requirements that apply to your environment. See our PCI DSS penetration testing page and our guide to what PCI DSS 4.0 penetration testing means for UK retailers.
Can you test B2B wholesale and trade-ordering portals?
Yes. Trade and wholesale ordering portals with customer-specific catalogues and pricing, credit limits, company hierarchies and approval chains between buyer roles, and separation between trade accounts so one customer cannot see another’s pricing or orders.
Do you test subscription commerce and loyalty or gift-card platforms?
Yes. Subscription and recurring-order commerce, including plan changes, proration, renewal and cancellation logic, plus loyalty points, gift cards and voucher redemption: balance manipulation, double redemption, and transfer or referral abuse.
Can you test our point-of-sale and omnichannel integration?
Yes. Store and device identity, offline transaction reconciliation, in-store refunds against online orders, and staff permissions across your point-of-sale and e-commerce backend, alongside the APIs that keep stock and pricing in sync between channels.
How do you test returns, refunds and customer accounts?
We test order-management and returns platforms, return-authorisation logic, and whether a refund’s recipient, amount or shipping address can be changed by someone who should not be able to. Customer-account testing covers account takeover across saved cards, addresses and order history.
What’s in the report?
Executive summary (board-ready), technical report with CVSS 3.1 scores, reproduction steps, screenshots, specific remediation guidance, and a 60-minute walkthrough call. Letter of attestation issued after free retest.
Do you sign NDAs?
Yes. We sign client-supplied NDAs as standard. Engagement data is protected under our ISO 27001 (BSI-audited) information security management system.
How quickly can you start?
From signed scope to active testing in 24 hours where required. Standard pipeline is 3-5 business days from initial scoping call to test start.
Are your testers UK-based and what certifications do they hold?
Every engagement is performed by vetted UK-based CREST-certified testers matched to your engagement based on security clearance, compliance scope, and sector specialism. Testers hold CREST certifications relevant to their discipline (CRT, CCT APP, CCT INF, CCSAM).
20+ CREST-accredited testing services in one place
Web, mobile, API, cloud, AI, infrastructure, red team. Pick the test that fits your environment.
Get my Retail and E-commerce pen test scope
Tell us which platform you run and what’s in scope. A CREST-certified pen tester will contact you within one business day with a fixed price.
