API SecurityAPI SecurityTesting & Assessment
Your APIs connect everything. Mobile apps, partner systems, internal services. They're also wide open to abuse if nobody's testing them properly. We go after REST, GraphQL, SOAP, and WebSocket APIs the way an attacker would, so you can fix what's exposed before they find it.
REST, GraphQL, SOAP & WebSocket
Tested by specialists who understand protocol-specific attack vectors, not just generic scanners.
Results in Days, Not Weeks
Most API assessments completed within 5-10 business days depending on scope and endpoint count.
Detailed findings with PoCs
Every finding includes reproduction steps, request/response samples, and working proof-of-concept exploits.
The API Security Challenge
Every modern app runs on APIs. Your mobile app calls them. Your partners integrate through them. Your microservices depend on them. But most API endpoints are tested far less rigorously than the web apps sitting in front of them, and attackers know it.
There's no UI to click through, no visible error page to notice. API vulnerabilities hide in plain sight, a misconfigured endpoint, a broken access check, an over-permissive response. One exploited endpoint can leak your entire database or let someone tamper with transactions.
Breaches at companies like Optus, T-Mobile, and Peloton all started with API flaws. If you're running microservices, mobile apps, or partner integrations, your API surface is bigger than you think.
Our API Testing Methodology
We map your API surface, then go after it. Testing auth flows, poking at business logic, and trying to pull data we shouldn't have access to. OWASP API Top 10 is our baseline, not our ceiling.
REST API Testing
We enumerate every endpoint, documented or not. Then, test each one for auth bypass, parameter tampering, method smuggling, and access control failures. If your API responds to DELETE when it should only allow GET, we'll find it.
GraphQL Security
GraphQL's flexibility is its biggest security risk. We test for introspection abuse, query complexity bombs, batch request exploitation, and authorisation bypass at the resolver level.
SOAP & Legacy APIs
Many enterprise systems still depend on SOAP and XML-based APIs. Often with less security scrutiny than newer REST endpoints. We test them for XXE, SOAP header manipulation, and WS-Security flaws.
WebSocket Security
WebSocket connections stay open and many apps we test never re-validate auth after the initial handshake. We test for origin bypass, message injection, lack of per-message authorisation, and session hijacking over persistent connections.
OWASP API Security Top 10 Coverage
Key Testing Areas
Authentication & Authorisation
JWT/OAuth token manipulation, scope validation, refresh token security, API key exposure, session management
Data Exposure
Over-verbose API responses, PII in error messages, sensitive data in headers, and filtering bypass to access fields the client shouldn't see
Input Validation
Injection attacks, mass assignment, type confusion, schema validation bypass, parameter tampering
Business Logic
Rate limit abuse, resource exhaustion, pricing manipulation, workflow bypass, privilege escalation
API Gateway Security
Gateway routing bypass, request smuggling through transformations, caching poisoning via API responses, and direct-to-origin access bypassing gateway controls
Third-Party Integration
Partner API trust validation, webhook signature verification, callback URL manipulation, and risks from consuming untrusted third-party API responses
Deliverables
API Security Report
Full documentation of every finding. Endpoint, request/response samples, risk rating, exploitation scenario, and business impact. Organized by severity so your team knows what to fix first.
Proof of Concept
Working exploit scripts (curl, Postman, or your preferred tool) with step-by-step reproduction guides for every critical and high finding. Your devs can verify the issue in minutes.
Remediation Guidance
Specific fix guidance for each finding. Code changes, configuration tweaks, or design-level recommendations depending on what's needed. Written for developers, not auditors.
API Hardening Guide
A customised guide for your stack covering auth patterns, rate limiting, input validation, error handling, and header security. Keep it as a reference for your team going forward.
Retest Services
Free retest within 30 days of remediation to confirm vulnerabilities are properly fixed. You get a clean report you can share with auditors or stakeholders.
API Breaches Are Increasing
API-related breaches have surged in the last few years, and they tend to be expensive, often exposing millions of records in a single incident. The attack surface keeps growing faster than most teams can secure it.
If your APIs haven't been tested recently, they're probably your biggest blind spot. Let's fix that.
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Why Choose XParth?
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