Web application & API security testing
Break your app the way an attacker would — before they do.
OWASP Top 10
REST & GraphQL
Auth & Access Control
Business Logic
Automated scanning combined with manual, human-led testing across your web app, its APIs and the business logic connecting them — surfacing the broken authentication, injection flaws and workflow abuse that tools alone consistently miss.
Beyond a vulnerability scan
Tested the way a real attacker — or a malicious user — actually behaves.
Modern applications are rarely just a website — they’re a frontend talking to one or more APIs, which talk to databases and third-party services. Each layer carries its own risk.
Full-stack risk coverage
Frontend, API and business logic tested as the connected system they actually are.
OWASP Top 10 as the baseline
Injection, broken authentication and security misconfiguration, covered as standard.
Manual, human-led testing
Business-logic flaws that only surface when someone deliberately misuses the app.
REST & GraphQL API testing
Authentication, authorization and data exposure tested independently of the frontend.
What tools alone miss
Automated scanning plus manual exploitation for coverage a scanner can’t reach.
The short version
What Is Web Application & API Security Testing?
It examines your website, web app and the APIs behind it for vulnerabilities like broken authentication, injection flaws and business-logic errors — the issues most commonly exploited to steal data or take over accounts. It goes beyond a basic vulnerability scan, testing how your application actually behaves under attack, including flaws that only appear when someone deliberately misuses its intended functionality.
Three layers, each with its own risk profile — tested together, not in isolation:
Frontend
The website or web app itself, where client-side vulnerabilities live.
API
The backend the app talks to — where broken authorization can leak data.
Business Logic
The workflows connecting them, manipulable in ways no scanner is designed to catch.
What we test
Every layer between your users and their data.
Automated scanning for known vulnerability classes, plus manual testing for the flaws that require understanding what your application is supposed to do.
Why business logic matters
A clean scan report doesn’t mean a clean application.
Automated scanners are good at finding known vulnerability signatures — but they don’t understand what your application is supposed to do, so they can’t tell when that logic is being abused.
What a scan alone misses
Known signatures, not intended misuse.
A checkout flow that can be manipulated to apply a discount twice.
An API that returns another user’s data if you change one number in the request.
Multi-step workflows that can be reordered or repeated for an unintended result.
A false sense of security once the scanner reports zero critical findings.
What manual testing adds
A tester who understands intended behavior.
Testing methods that understand the application’s intended behavior well enough to break it.
API endpoints tested independently of the frontend, since they’re often more exposed.
Where most of the serious, exploitable vulnerabilities in real-world applications are actually found.
Proof-of-concept evidence for every finding, not just a signature match.
How it runs
From mapping the app to a verified fix, step by step.
Automated scanning establishes the baseline; manual testing is where the real findings come from.
01
Application mapping
Understanding the app’s functionality, user roles and data flows before testing begins.
02
Automated scanning
Baseline scanning for known vulnerability classes across the application and API surface.
03
Manual & business logic testing
Testing authentication, authorization and workflow-specific logic the way an attacker would.
04
API-specific testing
Testing API endpoints independently of the frontend, since APIs are frequently more exposed.
05
Reporting & retest
Proof-of-concept evidence and severity scoring, then a free retest once fixes are in place.
What you get
What lands on your leadership’s desk.
Evidence and guidance developers can act on, not just a list of vulnerability names.
01
Technical Findings Report
Every vulnerability with proof-of-concept evidence and CVSS-based severity scoring.
02
Business Logic Findings
Documented separately, since these require narrative explanation beyond a CVSS entry.
03
API Test Coverage Summary
Which endpoints were tested and what was found, endpoint by endpoint.
04
Remediation Roadmap
Prioritized, developer-actionable fix guidance.
04
Free Retest
Verification that fixes are genuinely effective once remediation is complete.
Frequently Asked Questions
Everything You Need to Know
From a single website scan to a full enterprise-wide assessment, PS INFOSEC covers every layer of your security posture — technical testing, cloud, compliance, and everything in between.
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Cybersecurity Engagements Scoped to Your Business
Every assessment is scoped to your systems and risk profile, so final pricing depends on what’s being tested — not a fixed monthly plan. These three tiers give a sense of what’s typically included at each stage.
Starter Security
Ideal for Small Businesses
Ideal for: small businesses getting their first formal security review
Vulnerability Assessment (network + application)
CVSS-based severity report
Remediation guidance
Most Popular
Advanced Protection
Ideal for growing companies
Ideal for: growing companies with a customer-facing product
Vulnerability Assessment (network + application)
CVSS-based severity report
Remediation guidance
Web Application & API Security
Testing
Free retest after remediation
Enterprise Security
Ideal for Larger Organizations
Ideal for: larger organizations or businesses facing a compliance milestone
Full Enterprise Cybersecurity
Assessment & Compliance
Services scope
Cloud, application,
infrastructure & compliance testing in one engagement
Consolidated Executive Dashboard & remediation roadmap
Active incident or readiness
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Contact us for active incident support, or to schedule an Incident Response Readiness Assessment.
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