An online store can keep accepting orders while something is seriously wrong behind the scenes. An attacker may have gained access to an administrator account. Automated bots could be testing stolen customer passwords. A flaw in the checkout process might allow discounts to be abused. Malicious code could be capturing information entered during payment without stopping legitimate transactions from completing.
For store owners, these are not simply technical vulnerabilities. They can become fraudulent orders, chargebacks, stolen customer accounts, exposed personal information, lost revenue, damaged customer trust, and costly incident response.
E-commerce VAPT helps businesses test the parts of an online shop that attackers are most likely to target. A useful assessment should examine much more than the public storefront. It should follow the customer journey, payment workflow, administrative access, APIs, integrations, and business rules that determine how money and data move through the store.
The objective is straightforward: find the weaknesses capable of harming the business before criminals discover how to use them.
Your Store Does Not Have to Go Offline to Be Compromised
Many store owners imagine a cyber-attack as a website becoming unavailable or displaying an obvious warning. Some of the most damaging e-commerce attacks are much quieter.
An attacker who inserts payment-skimming code does not necessarily want the checkout to stop working. They may prefer customers to continue purchasing normally while card information is silently copied elsewhere.
CISA describes e-skimming as malicious code introduced into e-commerce payment pages to capture payment card and personal information as customers enter it. Attackers may gain that capability through website vulnerabilities, compromised administrator credentials, cross-site scripting, or compromised third-party scripts.
Account attacks can be equally difficult to notice. Criminals can use usernames and passwords stolen from unrelated breaches and automatically test them against online shops. OWASP identifies credential stuffing as a common account takeover technique in which attackers replay previously compromised username and password combinations against another service.
The store may look completely normal throughout both attacks.
That is why e-commerce security testing should focus on what an attacker can achieve, not simply whether the website remains available.
Follow the Places Where an Online Store Can Lose Money or Data
A good e-commerce assessment should follow the commercial logic of the store.
Where can somebody gain valuable access? Where can prices or orders be manipulated? Which actions move money? What customer information can an account reach? Which systems control the checkout experience?
These questions lead to five areas that deserve particular attention.
1. Store Administration and Privileged Access
The administration panel is one of the most valuable parts of an online store.
Depending on the platform, an administrator may be able to modify products, change prices, install extensions, view customer information, alter payment settings, issue refunds, create new users, change website code, or access integrations.
Compromising that account can therefore give an attacker far more control than exploiting an individual customer account.
VAPT should examine how administrators authenticate, whether multifactor authentication protects privileged accounts, whether administrative interfaces are unnecessarily exposed, and whether lower-privileged users can reach functions they should not have.
Store owners should also think beyond the obvious admin login.
Hosting panels, content management systems, domain accounts, cloud consoles, source-code repositories, payment-provider accounts, and plugin marketplaces may all provide ways to influence the store.
If one account can change what customers see or what code their browser executes, it belongs in the security conversation.
2. Customer Accounts and Account Takeover
Customer accounts can contain more value than businesses sometimes realise.
A compromised account may reveal names, addresses, telephone numbers, order histories, loyalty balances, saved preferences, gift cards, subscription information, or stored payment tokens.
Attackers may also use established customer accounts to commit fraud because an existing account can appear more trustworthy than a newly created one.
Credential stuffing is particularly relevant to e-commerce because customers often reuse passwords across services. OWASP recommends layered protections against these attacks, with MFA providing one of the strongest defences where it can be implemented appropriately.
A VAPT assessment can examine whether the store makes account takeover easier through weaknesses such as:
- Weak password-reset processes
- User enumeration
- Missing rate limits
- Session-management flaws
- Inadequate protection against automated login attempts
- Broken authorisation between customer accounts
- Insecure changes to email addresses or passwords
- Weak administrative account recovery
Testing should also consider what happens after an account is compromised.
Can an attacker change delivery details without additional verification? Can loyalty credit be transferred? Are stored cards or payment methods exposed? Can previous invoices reveal sensitive information?
Preventing the login attack matters, but limiting what a stolen account can achieve matters too.
3. Prices, Discounts, Refunds, Gift Cards, and Checkout Logic
Not every e-commerce attack requires breaking through a conventional security control. Sometimes the attacker simply persuades the application to perform a legitimate action in a way the business never intended.
Imagine a discount code designed to provide 20% off one order. Customers might attempt to apply it repeatedly, or combine two promotions despite business intentions for them to be mutually exclusive. Users could also modify product quantities to unexpected values or alter prices sent directly from the browser. Furthermore, backend systems risk having a single refund triggered twice or gift-card balances enumerated automatically.
These are business logic vulnerabilities.
OWASP’s Business Logic Security guidance uses e-commerce examples including manipulated prices, negative quantities, repeated coupon use, workflow bypasses, and race conditions. The underlying problem is often that the system trusts a sequence or value that a dishonest user can manipulate.
Automated tools often struggle with these weaknesses because the individual requests may look perfectly valid. A human tester can approach the store more like a motivated fraudster. Instead of asking only whether a parameter contains a technical vulnerability, they can ask whether the purchasing process can be abused for financial benefit.
Our detailed guide to business logic vulnerabilities explains why these flaws frequently require manual investigation rather than scanner-only testing. For an e-commerce owner, this part of VAPT can be especially valuable because the outcome may be direct financial loss rather than a conventional data breach.
4. Checkout and the Payment Journey
The checkout is the point where customer trust, payment security, and store revenue converge, thereby making it an obvious target. The exact risk depends heavily on how the store accepts payments. Some merchants redirect customers to a payment provider, while others embed a third-party payment form. Some environments have payment-page elements or scripts running within pages controlled by the merchant.
Store owners should know which model they use because the security implications and PCI DSS responsibilities differ.
PCI SSC specifically addresses the risk of scripts affecting e-commerce payment pages. Current PCI DSS guidance includes controls aimed at ensuring relevant payment-page scripts are authorised and protected against unauthorised changes.
For a broader explanation of testing obligations around payment environments, see our guide to VAPT for PCI DSS and payment environments.
A payment-focused VAPT assessment may examine whether an attacker could:
- Alter the checkout flow
- Manipulate transaction values
- Inject unauthorised scripts
- Redirect customers towards a malicious payment page
- Access payment-related administration functions
- Abuse payment callbacks or webhooks
- Replay transactions
- Bypass expected payment states
- Reach sensitive payment infrastructure from another compromised system
Store owners should not assume that outsourcing card processing means the rest of the website no longer matters.
The merchant website still influences the customer’s path towards payment.
5. APIs, Plugins, and Third-Party Integrations
Modern online stores are rarely one self-contained application.
They connect to payment gateways, couriers, inventory systems, CRMs, email platforms, analytics tools, advertising services, fraud-detection providers, live-chat systems, marketplaces, review platforms, tax services, and numerous plugins or extensions.
Every connection creates another trust relationship.
An API might expose customer records without checking ownership correctly. A webhook may accept requests without adequate verification. An old plugin could contain a known vulnerability. A third-party script running in the customer’s browser may have access to sensitive page content.
APIs deserve particular attention because many customer and administrative actions now happen through them even when users interact with a conventional web interface.
If the store has mobile applications, marketplace integrations, headless commerce components, or separate front-end and back-end systems, APIs may represent a substantial part of the attack surface.
Our API VAPT guide covers those risks in greater depth. The important point for the store owner is that protecting www.yourstore.com alone may not protect the systems that actually make the shop work.
Outsourced Payments Do Not Mean Outsourced Website Security
A common assumption is:
“We use a major payment provider, so payment security is their responsibility.”
The payment provider certainly carries responsibility for its own environment. That does not make the merchant’s website irrelevant.
PCI SSC issued additional clarification in June 2026 for merchants using SAQ A. It confirms that applicable e-commerce merchant webpages can still require external vulnerability scanning by an Approved Scanning Vendor even where payments are redirected to, or embedded from, a third-party payment service provider. PCI SSC explains that compromise of the merchant webpage could still compromise the payment process.
This is particularly important for smaller retailers that intentionally outsource payments to reduce their direct card-data exposure.
Outsourcing can reduce risk and scope. It does not mean an attacker cannot compromise the merchant site and interfere with how customers reach the payment provider.
Store owners using PCI DSS SAQ A can review PCI SSC’s current clarification on this issue directly. The practical lesson is not that every store owner needs to become a PCI specialist. It is that you should understand your payment architecture rather than assuming somebody else owns every part of the risk.
What Should an E-Commerce Owner Ask to Have Tested?
Buying “a penetration test” without understanding its scope can produce a report while leaving some of the most important risks untouched. Before testing begins, a store owner should be able to explain how the shop works from a business perspective. A useful conversation with the tester should cover:
| Business area | Questions the assessment should help answer |
| Administrator access | Could an attacker gain or escalate privileged access to the store? |
| Customer accounts | Can one customer access another customer’s information or take over accounts too easily? |
| Checkout | Can prices, quantities, discounts, shipping, or payment states be manipulated? |
| Payments | Could attackers interfere with the route between the customer, store, and payment provider? |
| Refunds and credits | Can refunds, gift cards, loyalty points, or promotional value be abused? |
| APIs | Do APIs enforce the same authentication and authorisation rules as the website? |
| Integrations | Could plugins, webhooks, scripts, or connected systems create an attack path? |
| Customer data | Can attackers reach information beyond what their account should expose? |
| Administration infrastructure | Could hosting, CMS, cloud, or other privileged systems provide control of the shop? |
This conversation is useful even before the technical assessment starts.
It often reveals that the store’s real attack surface is larger than the website itself.
Pay Particular Attention to Automated Abuse
Some attacks against online stores are not traditional exploitation at all. They are legitimate features used automatically at a scale the business never intended. OWASP’s bot-management guidance identifies automated threats including credential stuffing, fake account creation, card testing, inventory hoarding, gift-card enumeration, scraping, and abuse of limited-stock purchases.
These attacks can create very real costs.
A bot may reserve scarce inventory and prevent genuine customers from buying it. Automated card testing can generate payment-processing costs and fraud alerts. Credential stuffing can produce large numbers of customer complaints. Coupon automation can exploit promotions faster than staff notice the pattern.
Standard vulnerability scanning is unlikely to answer whether these flows can withstand deliberate automated abuse. For stores where these problems matter commercially, the VAPT scope should explicitly include relevant anti-automation and abuse scenarios. Otherwise, the assessment may conclude that the application contains few conventional vulnerabilities while completely missing the ways criminals can exploit its legitimate functionality.
Which Findings Should a Store Owner Fix First?
A VAPT report may contain vulnerabilities ranging from minor technical observations to weaknesses requiring immediate attention. Store owners need a way to separate them. A useful priority order considers the potential business consequence rather than looking at technical severity alone.
Fix urgently when a weakness could enable:
Administrative takeover. Anything providing control of the store, hosting environment, payment configuration, or privileged user accounts deserves serious attention.
Cross-customer data access. A customer should never be able to access another customer’s personal information or order records.
Payment interference or data theft. Weaknesses affecting checkout scripts, payment workflows, transaction integrity, or payment-related systems can have direct financial and compliance consequences.
Remote exploitation of an internet-facing system. An unauthenticated attacker who can exploit a public system already has a practical route into the environment.
Large-scale account takeover. Weak login or recovery controls can turn one security flaw into hundreds or thousands of compromised customer accounts.
Direct financial abuse. Price manipulation, repeat refunds, gift-card flaws, coupon abuse, or payment-state bypasses can create losses even without a traditional system compromise.
The best report should explain these consequences clearly enough that a store owner does not need to interpret a technical score to understand what needs attention.
Do Not Schedule Your First Serious Test the Week Before Black Friday
E-commerce businesses have periods when both revenue and operational pressure increase. For instance, major sales events, holiday periods, product launches, promotional campaigns, and high-traffic seasons are poor times to discover a critical vulnerability that requires urgent redevelopment. So, security testing is more useful when the business has enough time to act on the findings. Good triggers for an e-commerce VAPT assessment include:
- Launching a new store
- Replatforming or migrating the website
- Introducing a new checkout
- Changing payment providers
- Releasing a customer mobile application
- Launching major new API integrations
- Making substantial infrastructure changes
- Adding significant account or loyalty functionality
- Preparing for an important sales period
- Following a serious security incident
- Completing significant remediation from a previous assessment
The timing should reflect change and business risk, not simply an annual calendar reminder.
For a major seasonal period, test early enough to fix important findings and verify the changes before traffic peaks.
Final Thoughts
An online store is not just a website. It is a commercial system connecting customers, accounts, products, prices, inventory, promotions, payments, refunds, administrators, APIs, and third parties. A security assessment that ignores those relationships can find technical vulnerabilities while missing some of the attacks most capable of hurting the business.
Aegixis VAPT Services can assess e-commerce platforms with testing focused on the attack paths that matter to online retailers, including customer accounts, administrative access, checkout workflows, APIs, integrations, and relevant payment-related systems.
