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Service 08

WEB SECURITY
TESTING

Your web application is your most exposed attack surface. We test it the way attackers test it - manually, methodically, and without the blind spots that automated scanners leave behind.

BEYOND THE OWASP LIST

Web security testing is a manual, specialist-led assessment of your web application designed to identify every exploitable vulnerability - from classic injection flaws and authentication bypasses to complex business logic errors that no automated tool will ever detect. We test the application as an attacker would: by understanding how it works, where it trusts user input, and how its components interact in ways the developers didn't intend.

Our assessments cover OWASP Top 10 and API Security Top 10 as a baseline - but we go significantly beyond. The vulnerabilities that cause real-world breaches are rarely the ones on a list. They're the race conditions, the multi-step logic flaws, the IDOR chains, and the authentication assumptions that only a human tester with deep application security expertise will find.

Injection & Input Validation
SQL injection, NoSQL injection, command injection, SSTI, XSS (reflected, stored, DOM), XXE, SSRF - comprehensive testing of all input vectors against all injection classes.
Authentication & Session Management
Testing of login mechanisms, password policies, session token entropy and lifetime, multi-factor authentication bypass, account lockout, and credential stuffing resistance.
Access Control & Authorisation
Horizontal and vertical privilege escalation, IDOR testing across all object references, broken function-level access control, and JWT/token manipulation attacks.
Business Logic Testing
Workflow manipulation, price tampering, quantity overflow, race conditions, state machine bypass, and any application-specific logic that an attacker could exploit for financial or data gain.
API Security Assessment
Full REST, GraphQL, and SOAP API testing - endpoint enumeration, authentication testing, excessive data exposure, mass assignment, and rate limiting bypass.
Client-Side Security
JavaScript analysis, postMessage security, CORS misconfiguration, subresource integrity, CSP bypass techniques, and sensitive data exposure in client-side code.

COMMON DISCOVERIES

These are the most common exploitable vulnerabilities we discover in web application assessments:

Insecure Direct Object Reference (IDOR) - access to other users' dataCRITICAL
Broken authentication - session fixation or predictable tokensCRITICAL
SQL injection - error-based or time-based blindCRITICAL
JWT algorithm confusion (alg:none / RS256 to HS256)HIGH
Business logic bypass - price or quantity manipulationHIGH
Stored XSS in user-generated content fieldsHIGH
CORS misconfiguration with credentialed requestsMEDIUM
Sensitive data in JavaScript source / localStorageMEDIUM

HOW WE TEST

01
Reconnaissance & Mapping
Full application crawling and mapping - all endpoints, parameters, cookies, headers, and third-party integrations enumerated before testing begins. Attack surface documented in full.
02
Authentication & Access Control Testing
Comprehensive testing of all authentication mechanisms and access control implementations - covering every user role, every privilege boundary, and every authorisation decision point.
03
Input Validation & Injection Testing
Manual injection testing across all input vectors. Every parameter, header, cookie, and file upload field tested against relevant injection classes - not just the ones a scanner would flag.
04
Business Logic Analysis
Deep analysis of application workflow and state management - testing for logic flaws that require understanding the application's purpose, not just scanning its inputs.
05
Exploitation & Impact Confirmation
Every finding is exploited to confirm severity and document realistic impact. No theoretical vulnerabilities - every item in the report has been verified by the tester.
06
Reporting & Documentation
Every finding documented with full technical evidence - request/response captures, reproduction steps, CVSS scores, and developer-actionable remediation guidance. Delivered with an executive summary for leadership and a technical report your development team can work from directly.

DELIVERABLES & OUTCOMES

Executive Summary
Clear, business-level overview of risk posture, critical findings, and recommended priorities for leadership and board audiences.
Full Technical Report
Every finding documented with description, request/response evidence, CVSS score, business impact, and developer-actionable remediation guidance.
Remediation Roadmap
Findings prioritised by risk and fix effort - a practical action plan your development team can work through sprint by sprint.
Debrief Call
60-minute walkthrough with your development and security team - every finding explained, questions answered, and remediation approach discussed.
30-Day Remediation Support
Direct access to the lead tester for 30 days to answer remediation questions and confirm that fixes address root causes correctly.
Retest & Verification
Once your team has addressed the findings, we retest every fixed vulnerability to confirm the remediation is complete and no new issues were introduced - so you go live knowing the gaps are actually closed, not just marked resolved.

Know what's exploitable before an attacker does.

Start with a free 30-minute call. We'll discuss your application, your risk priorities, and scope a web security assessment that gives you real answers - not a recycled scanner report.

Talk to Our Team