Web Application
Penetration
Testing
We test your application as an authorised attacker would — combining manual exploitation, business-logic analysis, access-control testing and API testing to identify vulnerabilities that automated scanning can miss.
Web Application Penetration Testing, Built for How You Ship
Web application penetration testing is an authorised, human-led attack simulation against your live product — not an automated scan. Grey Shield's engagements combine manual exploitation, business-logic testing, and API testing to find the flaws that matter before a real attacker, auditor, or enterprise customer does. Every engagement follows the Grey Shield testing methodology, aligned to the OWASP Web Security Testing Guide and PTES.
We work with Indian SaaS platforms and fintech products where a single missed access-control bug can mean cross-tenant data exposure or a compromised payment flow — the kind of finding a generic vulnerability scanner is not built to catch. Our reports are written to be usable twice: once by your developers to fix the issue, and once by your security or compliance team to answer an enterprise customer's questionnaire or auditor's request.
New to Grey Shield? Read more about our team, browse recent case studies, or go straight to requesting a scoping call.
Our approach is informed by the OWASP Web Security Testing Guide. For deeper source-level coverage, see our source code review; for API-focused assessments, see API security testing.
Multi-Tenant SaaS Platforms
Tenant isolation, role-based access control, subscription and billing logic, and API endpoints tested against every plan tier and user role — ahead of a security review from an enterprise prospect.
Fintech & Payment Products
Authentication, KYC and onboarding flows, transaction and payment logic, and API integrations tested for the abuse cases that put customer funds and financial data at risk.
Pre-Funding & Pre-Audit
A structured, evidence-backed report you can hand to investors, enterprise procurement teams, or auditors as proof that your application has been independently tested.
What We Find
Coverage is scoped to the application and threat model, with testing informed by the OWASP Web Security Testing Guide and relevant OWASP application and API risks.
SQL, NoSQL, and command injection; reflected, stored, and DOM-based XSS; server-side template injection — traced from every user-controlled input to its sink.
Credential stuffing resistance, weak password reset flows, session fixation, JWT algorithm confusion, predictable tokens, and missing MFA enforcement on sensitive actions.
Insecure direct object references, broken object and function-level authorization, horizontal and vertical privilege escalation across every user role in the application.
Price manipulation, coupon and discount stacking, race conditions in checkout and withdrawal flows, workflow step-skipping, and negative-quantity or overflow abuse.
Excessive data exposure, mass assignment, missing rate limiting, GraphQL introspection abuse and nested query denial-of-service, and broken function-level authorization across endpoints.
Missing security headers, verbose error messages leaking stack traces, exposed debug endpoints, permissive CORS policies, and outdated components with known CVEs.
Testing Methodology
Aligned to the OWASP Web Security Testing Guide (WSTG) and PTES — manual-first, role-aware, and mapped to real user journeys. This is the web-application-specific application of our core testing methodology.
Scoping & Application Mapping
Walk through every user role, feature, and workflow. Map the full application surface — pages, API endpoints, hidden parameters, and third-party integrations in scope.
Automated Reconnaissance & Baseline
Use appropriate automated tooling to identify common signals and map areas that deserve deeper manual attention. Automated output is validated rather than copied into the final report.
Manual Exploitation
Manually test authentication, session handling, access control, and every input field for injection — proving impact with working proof-of-concept requests, not theoretical risk.
Business Logic & Access Control Testing
Test each feature against every user role to surface IDOR, privilege escalation, and workflow abuse that requires understanding the application's intent to uncover.
API & Integration Testing
Test REST and GraphQL endpoints directly — bypassing the front-end to probe authorization, rate limiting, and data exposure at the API layer.
Reporting, Remediation & Retesting
Deliver evidence-backed findings with impact, reproduction details and practical remediation guidance. Retesting can be scoped after remediation to verify whether reported issues have been addressed.
What We Use
Industry-standard tooling backed by manual, human-led exploitation — no report is ever a raw scanner export.
What You Get
Annotated Findings Report
Every vulnerability documented with affected endpoint, request/response evidence, CVSS score, and exact fix recommendations ready for your developers to action.
Executive Summary
A non-technical summary of application security posture, risk exposure, and top-priority fixes — written for leadership and product stakeholders.
Developer-Ready Findings
Findings are structured so engineering teams can understand the affected component, reproduce the issue, assess impact and plan remediation. Export formats can be agreed during scoping where required.
Retesting After Remediation
After fixes are deployed, retesting can verify whether previously reported findings have been remediated. Retest scope and timing are agreed as part of the engagement.
Developer Debrief Session
A live walkthrough with your engineering team explaining each attack scenario, answering fix questions, and advising on secure coding patterns going forward.
Security & Compliance Context
Where relevant to the engagement, findings can be organised against the security framework or customer requirement supplied during scoping. Specific compliance mapping is subject to scope.
Extend the Assessment
Web application testing is one part of an application security program. Add the coverage that matches your architecture and risk.
Source Code Review
Review security-sensitive implementation details, data flows, authorization logic and other code-level weaknesses that runtime testing may not expose.
API Security Testing
Assess API authentication, authorization, object access, data exposure and business logic across the interfaces your application depends on.
Grey Shield Methodology
See how Grey Shield scopes, tests, documents findings and supports remediation across security engagements.
Common Questions
Straight answers about scope, coverage, and what a web application penetration test actually involves.
What is web application penetration testing?
What's the difference between a vulnerability scan and a web application pentest?
Does this cover the OWASP Top 10?
Can this include API testing?
How long does a web application penetration test take?
Do you need our source code to test?
Is this suitable for Indian SaaS and fintech products handling customer or financial data?
Find the Flaws
Before Launch
Send us your application — we'll test it the way a real attacker would and return findings your developers can act on immediately. The testing schedule is agreed after scope, access and testing-window requirements are confirmed.