Attack Readiness

Your web application handles real data.
Does it withstand a real attack?

Deep manual security testing of your web application and APIs. Beyond OWASP Top 10 to business logic flaws, authentication weaknesses, and chained vulnerabilities.

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What is a web application pentest?

You know your web application is customer-facing. You have data flows, authentication, and APIs to protect. You get a detailed picture of every vulnerability an attacker can exploit, with reproduction steps and fix guidance. A web application pentest tests beyond automated scanners: authentication, authorisation, business logic, race conditions, and API security are all examined by hand. The team thinks like an attacker targeting your specific application.

About this service

Web Application Pentest: beyond the scanner

Web applications are the primary contact point with your customers, employees, and partners. A vulnerability in your web application is not only a technical problem; it is a direct risk to customer data, business continuity, and reputation. A web application pentest examines your application in depth for security flaws, from authentication to business logic.

The team tests not just the OWASP Top 10 but goes further. Business logic flaws, race conditions, access control issues, and complex authentication flows are examined manually. Automated scanners structurally miss this class of vulnerability. DEFION combines tooling with manual expert investigation.

The test covers both frontend and backend, including the APIs that drive the application. Modern web applications are often SPAs with complex API architectures. The team understands those technologies and tests them correctly. Each finding includes a description, reproduction steps, risk rating, and concrete fix suggestions in the context of your technology stack.

Why this matters

Three risks in web applications scanners miss

  • Business logic flaws cannot be scanned

    Attackers abuse your application's own logic: bypassing payment steps, escalating privileges through workflow manipulation, or accessing other users' data via predictable identifiers. No scanner finds these.

  • APIs are the new attack surface

    Modern applications expose extensive APIs. Undocumented endpoints, missing authentication, excessive data exposure, and mass assignment vulnerabilities in APIs are exploited daily and missed by surface-level testing.

  • Authentication weaknesses are subtle

    Weak session management, insecure password reset flows, missing MFA enforcement, and JWT misconfiguration allow account takeover that automated scans do not detect without manual authentication testing.

What gets tested

Scope of the web application pentest

Authentication and session management
Authorisation and access control (IDOR, privilege escalation)
Input validation (SQL injection, XSS, SSRF, command injection)
Business logic (workflows, payment processes, discount codes)
API security (REST, GraphQL, SOAP)
File upload and download functionality
Cryptography and data storage
Error handling and information leaks
CORS, CSP, and other security headers
Third-party integrations and dependencies
Methodology

How DEFION conducts a web application pentest

01

Scoping

Defining the application, environments (test/acceptance/production), test accounts, and roles.

02

Application mapping

Mapping all functionality, endpoints, roles, and data flows before testing begins.

03

Automated scanning

Broad scan as a baseline for manual investigation, identifying known vulnerabilities quickly.

04

Manual investigation

In-depth testing of authentication, authorisation, business logic, APIs, and input validation by expert testers.

05

Exploitation and impact

Demonstrating the actual impact of found vulnerabilities with working proof-of-concept where possible.

06

Reporting

Report with reproduction steps, CVSS scores, and developer-oriented remediation guidance per technology stack.

What you receive

Deliverables

  • Executive summary
  • Technical report per vulnerability: description, reproduction steps, screenshots/PoC, CVSS score, remediation advice
  • Overview of tested functionality and coverage
  • Developer-oriented recommendations per technology stack
  • Report debrief with development team
  • Optional: retest after fixes
Target audience

Who is a web application pentest for?

Any organisation with a customer-facing or employee-facing web application handles data that must be protected. A web application pentest is essential before launch and after major updates.

  • Organisations with customer-facing portals or SaaS platforms
  • Companies launching a new application or major release
  • Development teams seeking security validation before go-live
  • Organisations with applications processing personal data or financial information
  • Companies that need to demonstrate compliance (PCI DSS, ISO 27001, SOC 2)
Frequently asked questions

FAQ

Is the test performed on a production or test environment?
Preferably on an acceptance or test environment that is functionally identical to production. If a test environment is unavailable, production testing is possible with extra precautions and agreed constraints.
How do you handle sensitive data during the test?
All test data and findings are processed according to ISO 27001. Sensitive data encountered during the test is documented as evidence but not exfiltrated. After completion, test data is securely deleted.
Do you also test the APIs behind the application?
Yes. Modern web applications run on APIs. The team tests both the APIs driven by the frontend and any undocumented endpoints. REST, GraphQL, and SOAP are all supported.
What if my application is under continuous development?
We recommend combining periodic pentests (at minimum annually or at major releases) with security integration in the development process. A one-time pentest is a snapshot; ongoing security requires a broader approach.
How quickly can my team act on the findings?
Critical vulnerabilities are communicated immediately. The full report follows typically within 5 business days. Findings include reproduction steps and fix suggestions so your development team can act immediately.
External Pentest

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Mobile App Security Assessment

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Code Security Review

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Cloud Security Assessment

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Ready to test your web application?

Tell us about your application. We scope the right approach together and start within days.

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