WooCommerce Penetration Testing for Stores Taking Payments
WooCommerce penetration testing for a WordPress site that handles money, customer addresses and order history. An API key created with Read/Write permission lets whoever holds it read and change data in your store. CREST-certified testers, fixed price from £2,480, scoped in 24 hours.
- Unlimited retesting
- No rescheduling or cancellation fees
- Fixed quote within 24 hours
“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.”
Everything true of WordPress is true here, plus a checkout. WooCommerce adds its own roles, its own REST endpoints, a cart and order state machine, and usually a payment gateway plugin written by a third party. That is a lot of business logic, and business logic is where the money leaks.
Why a store needs more than a WordPress test
The failure modes are specific and repeatable. A REST API key created with Read/Write permission for an integration that only reports. A custom REST route registered with permission_callback set to __return_true. A webhook receiver that never checks the hash in the request headers. A coupon with no usage limit per user. A cart that trusts the price the browser posts.
WooCommerce documents that a blank webhook Secret defaults to the current API user’s consumer secret, so the key that reads your orders also signs the webhook deliveries your receiver trusts. Every API key is linked to one WordPress user, and Read/Write lets the application both read and write data in your store.
We test as a guest, a customer and a shop manager in turn. We post a lower price into the cart, apply a coupon twice, swap order IDs to read another customer’s invoice, replay a gateway callback to mark an order paid, and try each API key against routes it should never reach. So we pen test it the way a fraudster would, by working the flows rather than the parameters. ISO 27001, SOC 2, PCI DSS and Cyber Essentials Plus audits accept manual penetration test evidence. Scan-only evidence is generally insufficient.
CHECKOUT, COUPONS + CUSTOMER DATA
What we actually pen test on a WooCommerce store
Manual pen testing across the cart and checkout flow, the discount engine, the payment integration and every endpoint that returns customer data.
Price and cart manipulation
Whether the server recalculates totals or trusts what the browser sends, negative quantities, currency and rounding abuse, and shipping or tax rules that can be forced to a favourable value.
Coupon and discount abuse
Reuse of single-use codes, stacking of exclusive discounts, race conditions on redemption limits, and enumeration of valid codes through response timing or error differences.
Customer data exposure
Order, invoice, subscription and download endpoints tested for direct object reference flaws, plus whether one customer account can reach another customer’s addresses, order history or downloadable products.
Payment gateway integration
Callback and webhook verification, whether an order can be marked paid without a successful payment, replay of gateway responses, and what is stored locally that should not be.
Extension conflicts and vulnerabilities
Commercial and free extensions enumerated and version-matched, with manual verification of the ones touching checkout, accounts or pricing.
Account and session handling
Registration, password reset, guest to account conversion, and session fixation across the cart to checkout transition.
METHODOLOGY
WooCommerce Penetration Testing: From Scope to Attestation
CREST-aligned methodology built on OWASP Web Security Testing Guide, OWASP ASVS, NIST SP 800-115, and PTES. Each finding maps to all four standards plus your specific compliance regime.
Reconnaissance
Application mapping, technology fingerprinting, content discovery, parameter enumeration, authentication-flow analysis, role-matrix construction.
Vulnerability Assessment
Authenticated and unauthenticated automated scanning across every user role, plus targeted manual checks for known weakness patterns.
Manual Exploitation
Hands-on testing by a CREST-certified pentester. Business-logic exploitation, chained vulnerabilities, privilege escalation, impact validation.
Reporting + Retest
Executive summary, technical report with CVSS scores and reproduction steps, walkthrough call, free retest after remediation, attestation letter.
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 WooCommerce 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
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COMPLIANCE READY
Reports Mapped to Every Framework
Findings are explicitly tagged to the relevant control reference. Your audit team submits the report directly without translation work.
ISO 27001:2022
Annex A.8.8 management of technical vulnerabilities plus A.5.15-5.18 and A.8.2-8.5 access control validation.
SOC 2 Type I & II
CC6 logical access, CC7 system operations, CC8 change management evidence.
PCI DSS
Requirement 11.4 application penetration testing across cardholder data environments, including ecommerce penetration testing for online retail platforms.
FCA SYSC
SYSC 4.1.1R, 6.1.1R, 13 mapped to each finding for FCA-regulated firms.
UK GDPR
Article 32 effectiveness testing, customer-data security controls, ICO-acceptable evidence.
Cyber Essentials Plus
Direct certification through our IASME body status, single-vendor delivery.
PRICING
Transparent WooCommerce Penetration Testing Pricing
Pricing depends on app complexity, user-role count, business-logic depth, and integration surface. The day count flexes; the included deliverables stay the same across all engagements.
2 to 3 testing days
Single user role, basic CRUD application, marketing website with auth. Around 5 working days from kickoff to report.
Get a fixed quote3 to 5 testing days
Multi-role SaaS, business application with payment integration. Around 8 to 12 working days from kickoff to report.
Get a fixed quote5 to 7 testing days
Multi-tenant platform, complex authorisation matrix, integration-heavy applications. Around 15 to 20 working days from kickoff to report.
Get a fixed quotePart of Technologies We Pen Test. These are examples of the stacks we publish pages for, not a complete list. If yours is not here we still test it. Related pages:
BY SECTOR
WooCommerce Penetration Testing for Your Sector
Sector-specialist scoping for UK businesses with sector-specific compliance regimes and threat models.
Fintech & FCA-Regulated
FCA SYSC, Open Banking FAPI 1.0, PSD2 SCA, payment-flow scrutiny, KYC/AML testing.
Fintech sector pageSaaS Companies
SOC 2 Type I & II evidence, multi-tenant boundaries, role escalation, customer-tenant isolation.
SaaS sector pageLaw Firms
SRA Cyber Standard, privileged data, conveyancing fraud defence, partner-tier procurement.
Law firm sector pageHealthcare
NHS DTAC, DSP Toolkit v6, UK GDPR Article 32, EHR systems, telehealth platforms.
Healthcare sector pageInsurance
FCA / PRA Operational Resilience, cyber underwriting, claims data, broker portals.
Insurance sector pagePublic Sector
CCS / G-Cloud framework, NCSC-aligned, citizen-facing services, PSN-compliance scrutiny.
Public sector pageWHY EJN LABS
What You Get From WooCommerce 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
Our REST API key has Read/Write permission. Is that a problem?
It is if the integration only reads. WooCommerce offers Read, Write and Read/Write for each key and links every key to a WordPress user, and Read/Write lets the application both retrieve and update data in your store. We test what each key can reach and whether a Read key can still write through any route.
Can you test without placing real orders?
Yes. We work in a sandbox gateway mode wherever your setup allows it. Where a check genuinely needs a live transaction we agree it in advance, use the smallest possible amount and refund it.
What about our subscription plugin?
In scope. Recurring billing is a common source of logic flaws: cancelled subscriptions that keep delivering, renewals that can be forced early, and proration that can be pushed negative.
Will testing take the store down?
No. We avoid destructive and high-volume checks against production by default, and anything with a risk of disruption is scheduled with you or run against staging instead.
Our webhook Secret field is blank. Is that safe?
WooCommerce falls back to the current API user’s consumer secret, so deliveries are still signed. The risk moves to two places: the receiver that never verifies the hash in the request headers, and the fact that one leaked consumer secret now forges webhooks as well as calling the API. We send forged and replayed deliveries at your receiver to see what it accepts.
What exactly do you test on a WooCommerce store?
Your store: plugins and their permissions, the WooCommerce and WordPress REST endpoints, admin and shop-manager roles, checkout and payment integration, and the hosting around it. See our retail and e-commerce and checkout and payment flow testing pages.
20+ CREST-accredited testing services in one place
Web, mobile, API, cloud, AI, infrastructure, red team. Pick the test that fits your environment.
Get a fixed price for your store
Tell us the gateway, the extension list and whether subscriptions are in scope. You get a fixed-price quote from a named CREST assessor within one business day, unlimited retesting, and no cancellation or rescheduling fees.
