Manual, adversarial testing of your web applications — business logic abuse, broken access control and authentication flows attackers actually use, uncovered by NCSC CHECK-certified testers.
Book a scoping call See the methodologyEvery web application enforces rules no tool can read: what a discount is worth, who may see an invoice, when an order can be cancelled. Attackers exploit exactly those rules — and automated scanning will never flag them.
Refund flows, tiered pricing, approval chains — if a step trusts the client or skips a check, it's an attack surface. We test it the way a dishonest customer would.
Changing an ID in a URL is the most common breach vector on the web. Broken object-level authorisation leaks data without a single alert firing.
ISO 27001, PCI DSS and Cyber Essentials Plus expect genuine adversarial testing — a scan report doesn't satisfy an auditor or an insurer.
The web application layer has been the leading initial breach vector for years — and the flaws that dominate aren't exotic; they're the ones a careful manual test finds first.
Web applications and servers consistently rank as the top attack pattern behind data breaches — ahead of everything else attackers target.
Source: Verizon DBIR, attack pattern analysisBroken access control tops the OWASP Top 10 — and the vast majority of applications tested expose at least one authorisation flaw.
Source: OWASP Top 10 (2021)Of breaches involve broken access control, the category OWASP says has the widest potential impact of any Top 10 risk.
Source: OWASP Top 10 (2021)Industry research has repeatedly found third-party and supplied web components in the majority of real-world web exploitation incidents.
Industry incident patternsFigures reflect published industry research and frameworks at time of writing; sources cited per card. We're happy to walk through the underlying studies on a scoping call.
Web application penetration testing is a controlled security assessment in which qualified testers simulate real-world attacks against a web application to uncover exploitable weaknesses in authentication, access control, business logic, session handling and the application stack.
Uses tester judgement to explore workflows, assumptions and edge cases automated scanners cannot understand.
Tests how real application rules can be abused to bypass controls, alter transactions or reach another user's data.
Tests behind the login across relevant roles because many serious flaws exist inside trusted user journeys.
Documents reproducible attack paths, business impact and practical fixes developers can implement and retest.
Web application penetration testing puts a certified human attacker inside your application's flows — probing authentication, session handling, authorisation, business logic and every component in the stack, then chaining individual flaws into the outcomes that actually hurt: data exposure, privilege escalation, fraudulent transactions.
Our CHECK-certified testers work from the same mindset as a real adversary: enumerate what the application trusts, abuse what it assumes, and prove impact — can a customer reach another customer's records? Can a low-privilege user approve their own refund? Can a session be stolen and replayed?
The result is a report written for decisions: every finding with an attack chain, business impact, severity you can defend, and remediation your developers can implement.
As a UK provider working under the NCSC CHECK scheme, our testing is recognised across UK government, financial services and regulated industries — and maps directly to Cyber Essentials Plus, ISO 27001, UK GDPR, DORA and NIS2 obligations.
A scanner matches signatures. A penetration tester reads your application the way your users and attackers do — and finds the logic flaws no signature exists for.
We map your application's workflows — orders, approvals, payments, roles — and attack the assumptions they rest on, not just the endpoints.
NCSC CHECK-certified professionals test your application by hand — with the judgment to spot what a scanner scores as noise but an attacker scores as a way in.
Single findings are noise. We connect the dots — an IDOR plus a weak session policy plus a permissive API — into the attack path a real adversary would walk.
We test behind the login as every role you have — customer, admin, staff — because most serious access-control flaws are invisible from the outside.
Every finding ships with the request, the code-level cause and the concrete fix — written so your team can reproduce, understand and close it without a call.
Fixes often introduce new flaws. We re-verify every remediation against the original attack chains at no extra cost — so your report ends clean, not half-patched.
Every engagement follows the same business-first process — scoped precisely to the systems that matter to your P&L.
Prompt injection, model abuse, RAG data leakage and agent tool misuse — tested before your AI goes live.
ApplicationsAuthentication flows, business logic and the full OWASP Top 10 — attacked the way a real adversary would.
ApplicationsREST and GraphQL endpoints, token handling, and authorisation gaps exposed through the interfaces your partners rely on.
NetworksExternal perimeters, internal networks and Active Directory — from internet-facing foothold to domain compromise.
ApplicationsiOS and Android apps dissected for insecure storage, weak transport and tampering risks on real devices.
NetworksCorporate Wi-Fi, rogue access points and WPA2/WPA3 weaknesses — tested on-site, at your offices.
Six phases, from scoping through to ongoing assurance. Every phase is documented, every finding is actionable.
We map your application's roles, workflows and integrations, agree test windows and credentials, and set the rules of engagement — so testing never collides with your trading hours.
Manual adversarial testing across the OWASP Top 10 and beyond: authentication and session abuse, business-logic attacks, broken access control, injection flaws and dependency vulnerabilities — chained into real attack paths.
Every finding written as an attack chain — the entry point, the privilege or data reached, the business consequence — with reproduction steps, evidence, OWASP mapping and a fix your developers can act on. Reports land within 5 working days.
We stay with your developers — by call or on-site — reviewing patches, advising on architecture and confirming each fix closes the flaw rather than redirecting it.
We replay the full attack chains, not just the individual findings — because a patched endpoint is worthless if the same flaw survives elsewhere in the workflow.
Applications change weekly. We re-test on your release cadence — every sprint, month or quarter — so new features arrive tested, not untested.
Fixed-fee, CHECK-certified, scoped around your real workflows. One call is enough to size it.
Book a scoping call