eCommerce Website Security
eCommerce website security tested the way attackers work: checkout skimmers, account takeover, payment logic, PCI DSS. Manual testing, fixed price, free retest.
eCommerce website security is what stands between your checkout and an attacker who wants your customers’ card numbers, their accounts, or a free order at your expense. A store is a richer target than a brochure site because money moves through it, personal data sits in it, and a single skimmer on the payment page can quietly harvest every card typed in for weeks before anyone notices.
We are a European offensive-security team that tests online stores the way real attackers hit them. Not a scanner run and a PDF, but manual work by engineers who probe your checkout, your promo logic, your account flows and your integrations until they either break something or confirm it holds. This page explains what we look at, how we work, and what you get.
What eCommerce website security actually covers
Securing a store is broader than “install an SSL certificate and a firewall”. The interesting risks live in the parts unique to commerce: the payment flow, the discount engine, the account system, and the third-party scripts loaded into pages where customers type sensitive data. Those are the areas a generic security check skips and an attacker heads straight for.
The threats that actually hit online stores
After years of testing stores across Europe, the same attacks come up far more than the exotic ones make the news. Focus your budget here and you close most of your real risk.
Payment-page skimmers
Magecart-style attacks inject a few lines of JavaScript into the checkout and copy card details as customers type, sending them to the attacker while the order completes normally. The customer, the store and often the payment processor see nothing wrong for weeks. We test how third-party scripts load on your payment pages and whether an attacker could inject their own, and we check the controls that would catch a skimmer if one landed.
Account takeover and credential stuffing
Shoppers reuse passwords, so attackers replay millions of leaked credentials against store logins, then drain loyalty balances, place orders to new addresses, or harvest saved cards. We test your login, password-reset and multi-factor flows for the gaps that let this scale, and we look at whether a taken-over account exposes stored payment or personal data.
Business-logic and payment abuse
This is where manual testing earns its fee. Can a discount code be stacked past its limit? Can the cart total be tampered with before the payment call? Can a refund be triggered without a return, or a gift card balance be replayed? A scanner never finds these because they are not bugs in the code, they are flaws in the rules, and only a human who understands commerce spots them.
Bots, scraping and inventory abuse
Automated bots snap up limited stock, scrape your pricing for competitors, and probe for weak endpoints around the clock. We assess how exposed your key flows are to automation and what it would take to make abuse expensive for the attacker rather than free.
How we secure a store
Our work is manual, evidence-based and run by certified offensive engineers who hold qualifications such as OSCP and OSWE. A scanner is a starting point that finds the noise; a human finds the exploitable path and, more importantly, chains several small issues into the one that actually costs you money.
Reconnaissance and mapping
We map the whole surface first: the storefront, the admin, the APIs your app and integrations call, the payment and shipping providers, and the third-party scripts on sensitive pages. You cannot secure what you have not mapped, and stores almost always have more exposed than the owner realises.
Manual testing and exploitation
Then we test by hand, using Burp Suite alongside custom tooling, working through authentication, access control, the payment flow, business logic and the APIs. Where we find a hole we prove it safely, so you get evidence of real impact rather than a theoretical warning, and we agree any noisy checks in advance to protect a live store.
Reporting and retest
You receive an executive summary for the people who sign off the budget and a technical report for the people who fix things, each finding carrying its impact, a CVSS score, exact reproduction steps and a prioritised remediation. After you fix, a free retest confirms the holes are genuinely closed.
Want this tested on your own systems?
Free 20-minute scoping call, a fixed price with no hourly surprises, and a free retest once you fix what we find.
eCommerce security and compliance
If you take card payments, PCI DSS is not optional, and the external testing and vulnerability-management requirements are where most stores fall short. Our reports are built to map to what the standard asks for, so an assessment doubles as evidence rather than a separate exercise.
PCI DSS
We align findings and the attestation letter with PCI DSS 4.0, including the penetration-testing expectation in requirement 11.4 and the malicious-script controls in requirement 6.4.3 that speak directly to payment-page skimming. Tell us your merchant level and acquirer, and we shape the evidence to it.
GDPR and data protection
A store holds names, addresses, order history and sometimes more. Under GDPR that is personal data you are accountable for, and a breach carries reporting duties and real penalties. Our testing looks specifically at where that data is exposed to access-control flaws, and the report gives you what you need for your own risk records.
ISO 27001, SOC 2 and beyond
Where you are pursuing ISO 27001 or SOC 2, or your enterprise customers demand proof, the same engagement provides the independent testing evidence those frameworks expect. One piece of work, several boxes ticked, and a single report your auditor recognises rather than one they push back and question.
Why a scanner is not enough for a store
Automated scanners have a place. They find missing patches, known-vulnerable components and obvious misconfigurations quickly and cheaply, and every store should run them. What they cannot do is understand your business. A scanner does not know that your loyalty points convert to store credit, that a specific promo code was meant for one use, or that an order confirmation endpoint leaks another customer’s address. Those are the flaws that lose real money, and they are invisible to a tool that only checks code against a list of known signatures.
There is also the false-positive problem. A raw scanner report buries three genuine issues under two hundred noise items, and your developers waste days triaging warnings that were never exploitable. We do the opposite: every finding in our report has been verified by hand and proven to matter, so the fix list is short, real and prioritised. You spend engineering time closing holes, not arguing with a tool.
Where attackers chain small issues
The engagements that find the worst outcomes almost never rest on one big bug. An information leak reveals a valid account format, a weak reset flow lets that account be taken over, and a broken access-control check then exposes every order behind it. Each step looks minor alone. Together they are a breach. Finding that chain is judgement work, and it is the core of what manual eCommerce security testing buys you.
How working with us works
We keep the process simple and predictable, because a store owner has a business to run and does not want a security engagement to become a second job. There is no price table on this page because every store is scoped individually; the number is fixed after a short call, never billed by the open-ended hour.
| Step | What happens | Timing |
|---|---|---|
| 1. Scoping call | A free 20-minute call to understand your platform, integrations, payment flow and what worries you | same week |
| 2. Fixed quote and NDA | A written scope and a fixed price, with a mutual NDA in place before any access is shared | 1–2 days |
| 3. Testing window | Manual testing against the agreed scope, with critical findings flagged as we find them, not held to the end | agreed dates |
| 4. Reporting | Executive summary plus a technical report, every finding with impact, CVSS and a fix | within days of finishing |
| 5. Free retest | Once your team has fixed the issues, we retest to confirm they are genuinely closed | after your fixes |
Every engagement is fixed-price, quoted after a free scoping call, and a retest is included. Get a fixed quote
What you get
The deliverable is a report you can act on, not a scanner export you have to interpret. The executive summary states the real business risk in plain terms: what an attacker could take, and what it would cost you. The technical section lists every finding with its severity, a CVSS score, the exact steps to reproduce it, and a prioritised fix your developers can action. Where it matters, the attestation letter and PCI DSS mapping give you the compliance evidence in the same document. And the free retest means you are not paying twice to confirm the work landed. If your engineers want to talk a finding through, we make time for a walkthrough call rather than leaving them to decode a document alone.
FAQ
How much does eCommerce website security testing cost?
Which platforms do you test?
Will testing disrupt my live store?
Does this satisfy PCI DSS?
Can you tell if my checkout already has a skimmer?
How is this different from the security my host provides?
Are the findings kept confidential?
How often should a store be tested?
Related services
Online retailers, marketplaces and subscription businesses across Europe that take card payments, hold customer data, and want their checkout, accounts and business logic tested by hand before an attacker or a PCI DSS assessor does it for them.
Security you can prove
The same standard on every engagement, big or small.
Evidence, not opinions
Every finding ships with a reproduction and proof of concept — no vague "maybe vulnerable".
Humans over scanners
Certified engineers find the logic flaws and chained attacks automated tools walk straight past.
Fixed price, free retest
You know the cost up front, and verifying the fix is part of the deal — not a second invoice.
Ready to lock this down?
Free scoping call, fixed price, free retest. Tell us what you're running and we'll take it from there — usually within one business day.
Tell us what you're running
Scoping is free. We reply within one business day, and under 30 minutes for active incidents.