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Enterprise cybersecurity, cloud security and compliance

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Web & API Security Testing

Secure the applications and APIs your business runs on.

ThreatGaurd tests your web applications and APIs the way real attackers do, from authentication and access control to business logic and data exposure, and shows your developers exactly how to fix what matters.

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Why it matters

Your applications and APIs hold your most valuable data.

Customer records, payments and business workflows all run through your web applications and the APIs behind them. That makes them the first place attackers look, and the place where a single flaw can expose many customers at once.

Web and API security testing shows you, with evidence, what an attacker could do with your applications today, and gives your developers clear steps to fix it.

  • Access control is easy to get wrong

    One missing check can let a user read or change another customer’s data. Scanners rarely notice, because the request looks normal.

  • APIs expose more than the screen shows

    Mobile apps, single-page apps and partner integrations call APIs directly, often getting back more data than any user should see.

  • Releases move faster than reviews

    New features, roles and endpoints ship every sprint. Without regular testing, new gaps can reach production unnoticed.

Business outcomes

What application and API testing gives your business

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  • Protect customer data

    Find and close the flaws that could expose customer records, payments or personal data.

  • Release with confidence

    Know that new features and APIs have been tested by people who think like attackers.

  • Fixes developers can apply

    Every finding comes with evidence and practical steps, so engineering time goes into fixing, not investigating.

  • Evidence that stands up

    Reports are structured for enterprise customers, auditors and security questionnaires.

Testing scope

Test every layer of your application, from login to the last API call.

Choose the areas that matter to you. Every engagement is scoped to your application, user roles and release plans.

Web application penetration testing

Customer portals, SaaS platforms, admin panels and internal tools, tested manually against the OWASP Top 10 and beyond.

What we check

  • Injection, cross-site scripting and server-side request forgery
  • Broken access control and insecure direct object references
  • File upload, deserialisation and template injection
  • Security headers, CORS and content security policy
Vulnerability Assessment & Penetration Testing
Common findings in this area Sample
  • Customer portal Users can open other users’ invoices Critical
  • File upload Server accepts executable file types High
  • Comments Stored cross-site scripting High

API penetration testing

REST and SOAP APIs behind your web and mobile apps, partner integrations and microservices, tested against the OWASP API Security Top 10.

What we check

  • Broken object- and function-level authorization
  • Mass assignment and excessive data exposure
  • Token, API key and secret handling
  • Rate limiting, pagination and resource abuse
Kubernetes, Containers & DevSecOps Security
Common findings in this area Sample
  • Orders API Any user can read any order by ID Critical
  • Users API Role can be changed in the request body High
  • Export API No limit on bulk data export Medium

GraphQL security testing

GraphQL APIs, tested for the issues that REST-focused tools and checklists often miss.

What we check

  • Field- and resolver-level authorization
  • Introspection and schema exposure
  • Query depth, complexity and batching abuse
  • Injection through arguments and variables
Request a GraphQL test
Common findings in this area Sample
  • Account query Other tenants’ fields readable Critical
  • Nested queries No depth limit, risk of service outage High
  • Schema Introspection enabled in production Medium

Authentication, SSO and session testing

Login, sign-up, password reset, multi-factor and single sign-on flows, where small mistakes give attackers a way in.

What we check

  • OAuth 2.0, OpenID Connect and SAML flows
  • JWT signing, expiry and validation
  • Multi-factor and password-reset bypass
  • Session handling, logout and fixation
IAM Security
Common findings in this area Sample
  • API tokens Token accepted without signature check Critical
  • Password reset Reset link reusable and long-lived High
  • Single sign-on Redirect address not validated High

Business logic testing

Abuse of how your application is meant to work: issues scanners cannot find, because every request looks legitimate.

What we check

  • Price, quantity and discount manipulation
  • Workflow and approval bypass
  • Race conditions in payments, refunds and limits
  • Tenant isolation in multi-tenant SaaS
Discuss your application
Common findings in this area Sample
  • Approvals Approval skipped by calling the final step Critical
  • Checkout Price can be changed in the request High
  • Refunds Same refund processed twice in parallel High

Integration and webhook testing

Third-party connections, webhooks and outbound requests that can expose internal systems or cloud credentials.

What we check

  • Webhook signature verification and replay
  • Server-side request forgery to internal and cloud services
  • Keys and secrets shared with third parties
  • Data passed to and from partner APIs
Cloud Infrastructure Security Assessment
Common findings in this area Sample
  • Image fetcher Can reach the cloud metadata service Critical
  • Payment webhook Signature not verified High
  • CRM connector Partner key has full admin rights Medium

Methodology

Recognised methods, matched to your application.

We follow the OWASP testing guides and agree the depth of testing with you during scoping.

  • Black box

    Unauthenticated testing, from the view of an anonymous attacker on the internet.

    Best for

    Public-facing sites and first assessments.

  • Most common

    Grey box

    Test accounts for each user role, so we can test what logged-in users can reach and change.

    Best for

    Most applications and APIs. Access-control issues usually surface here.

  • White box

    Access to source code, API specifications and architecture, alongside live testing.

    Best for

    Critical applications, complex logic and high-assurance needs.

Standards we follow

  • OWASP WSTG
  • OWASP Top 10
  • OWASP API Security Top 10
  • OWASP ASVS
  • CWE
  • CVSS scoring

How it works

From scoping call to verified fix, in five steps.

Talk to a consultant

  1. 01

    Scope and prepare

    We agree applications, APIs, user roles, environments and testing windows. An NDA is signed before any access.

  2. 02

    Map the application

    We map every page, endpoint and role, using your API specifications where available.

  3. 03

    Test and exploit

    Our testers manually test access control, authentication and business logic, supported by automated scanning, without disrupting users.

  4. 04

    Report and walk through

    You receive the reports, followed by a walkthrough with your product, engineering and security teams.

  5. 05

    Retest and close

    Once fixes are deployed, we retest and update the report to show what is closed.

Deliverables

Findings your developers can fix and your leaders can understand.

  1. Executive summary A short overview for leadership: overall risk, key issues and what to do next.
  2. Technical report Every finding with CVSS severity, OWASP and CWE mapping, request and response evidence and affected endpoints.
  3. Developer fix guidance Practical remediation steps for your stack that your developers can apply directly.
  4. Retest report Confirms which issues are fixed, for your records, customers and auditors.
  5. Letter of attestation A summary you can share with customers and partners without exposing technical details.
Report summary Sample report

Overall risk

High → Low after retest

Critical
1
High
4
Medium
7
Low
6

Open findings

18before retest,2after retest

Fix first

Any logged-in user can read other customers’ orders through the orders API

Owner: API team · 3 days

Use cases

When organisations test their applications and APIs

  • Before launching an application or API

    Find exploitable issues before real users, and attackers, reach it.

  • After a major release or redesign

    New features, roles and endpoints often introduce access-control gaps.

  • Opening APIs to partners or customers

    Make sure external consumers can reach only what they should.

  • Enterprise customer security reviews

    Answer SaaS security questionnaires with recent, independent test results.

  • Audit and certification evidence

    Support evidence requirements for SOC 2, ISO 27001 and PCI DSS.

  • Moving to microservices or a new framework

    Check that authorization and data handling held up through the change.

Industries we work with

Why ThreatGaurd

Application testing that speaks to developers and leaders.

  • Manual testing, not just scanning

    Scanners cannot understand your roles or business rules. Our testers test them directly.

  • Every user role covered

    We test what each role can see and do, where many of the most serious API issues are found.

  • Developer-ready reporting

    Request and response evidence with clear fix steps, so engineers do not have to guess.

  • Your data stays protected

    NDA before access, dedicated test accounts and encrypted report delivery.

Supports compliance evidence for

  • ISO/IEC 27001
  • SOC 2
  • PCI DSS
  • HIPAA
  • GDPR
  • India DPDP Act

Our reports support your compliance evidence. Certification and audit opinions are issued by your auditor or certification body.

How we handle your data

Guides & checklists

Preparing for an application or API test?

Practical checklists and articles to help you scope the test, prepare test accounts and get the most from the report.

Browse checklists Read cybersecurity articles

Related services

Go further after the test.

All cybersecurity services

FAQ

Questions leaders ask about application and API testing

Can’t find your answer? Our team is happy to help.

Contact our experts
What is the difference between web application testing and API testing?

Web application testing covers what users reach through the browser: pages, forms, sessions and client-side code. API testing goes directly to the endpoints behind your web and mobile apps, where data and business rules live. Most modern applications need both, and we usually test them together.

Do you only test against the OWASP Top 10?

No. The OWASP Top 10 and the OWASP API Security Top 10 are a baseline. We follow the OWASP Web Security Testing Guide and spend most of our effort on access control, authentication and business logic, which are specific to your application and cannot be found by scanners alone.

Do you need our source code?

No. Most tests are grey box: we use test accounts for each role and, if available, your API specifications. Source code access is optional and helps on critical applications or complex logic.

Can you test in production without affecting users?

Yes, with care. We agree testing windows, use dedicated test accounts and avoid destructive or high-volume tests in production. Where possible we recommend a staging environment that mirrors production, especially for payments and other data-changing actions.

What do you need from us to get started?

The application or API base URLs, test accounts for each user role, API documentation such as an OpenAPI file, Postman collection or GraphQL schema if you have one, and a technical contact. We share a scope document and rules of engagement for sign-off before testing begins.

How long does an application or API test take?

Most engagements take 1 to 3 weeks, depending on the number of applications, user roles and API endpoints in scope. Retesting is scheduled once your developers have deployed the fixes.

How is the cost calculated?

Cost depends on the size and complexity of the application: the number of pages and endpoints, user roles, integrations and the testing approach. After the scoping call you receive a fixed-scope proposal, so the cost is agreed before testing starts.

How often should we test our applications and APIs?

At least once a year and after significant changes, such as major releases, new user roles or new public APIs. Teams that release often can test their highest-risk changes between full assessments.

Will your report support SOC 2, ISO 27001 or PCI DSS?

Our reports are structured to support SOC 2, ISO 27001, PCI DSS and customer security reviews, with an executive summary, detailed findings, retest results and a letter of attestation. The final audit opinion always rests with your auditor, so if a specific format or accreditation is required, tell us during scoping and we will confirm what we can provide.

Get started

Know what an attacker could do with your applications.

Tell us what you want to test. We will come back with a clear scope and proposal, with no obligation.

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What happens next

  1. A short scoping callWe learn your goals, environment and timelines.
  2. A fixed-scope proposalClear scope, approach, timeline and cost, in writing.
  3. Testing on your scheduleTesting starts on the agreed date, with regular updates.