Overview
APIs are the digital gateways that connect your applications, users, and data. When not properly secured, they can expose sensitive information or allow unauthorized actions that put your entire system at risk.
Our API Penetration Testing service takes a practical approach, mapping every exposed endpoint, replaying and manipulating requests, and validating how your APIs handle authentication, authorization, and data flow under real attack conditions. Following the OWASP API Security Top 10, we combine automated analysis with targeted manual testing to uncover flaws that traditional scanners overlook.
API
Endpoint Discovery
Catalog all API routes, parameters, and methods.
Authentication & Authorization
Test OAuth flows, API key management, token handling, and access control.
Input Validation
Detect SQLi, NoSQLi, XXE, and command injection vulnerabilities.
Business Logic Testing
Identify workflow abuse, logic bypasses, and rate-limiting flaws.
Data Exposure Review
Evaluate sensitive data returned in responses, headers, or logs.
Automated & Manual Fuzzing
Discover vulnerabilities through malformed or unexpected input testing.
Transport Security
Verify TLS configuration, certificate handling, and secure communication.
Configuration & Error Handling
Check error messages, version disclosure, and security header enforcement.
What you will get
Deliverables that keep every stakeholder aligned
We deliver more than raw findings: you receive a complete package that leadership, engineers, and auditors can all act on immediately.
Reporting package
Evidence-rich documentation for executives and technical teams.
Executive summary that explains business impact, key risks, and the
narrative behind the assessment.
Vulnerability summary with grouped issues, risk owners, severity,
and time-to-fix guidance.
Technical analysis that includes screenshots, observations, attack
flow notes, and proof-of-exploitation where appropriate.
Metrics & scoring covering CVSS, likelihood/impact rationales,
and remediation priority to unblock quick decisions.
Remediation toolkit
Clear next steps, mapped to the people fixing the issues.
Excel remediation tracker that consolidates every vulnerability with
owners, status, due dates, and comments so progress is easy to measure.
Prioritized backlog with quick wins, blocked items, and prerequisites
highlighted to reduce remediation friction.
Restitution meeting to walk through findings live, align on
fixes, and answer engineer questions while the context is fresh.
Optional retest to validate patches and refresh CVSS scores so the
final report reflects your latest posture.
Where this service excels
Recent scenarios our team solved
Real-world stories that mirror the way customers deploy, defend, and recover.
Logistics
Inventory API abuse leaking shipment data
Discovered missing authorization on a bulk status endpoint used by partner integrations.
Outcome
Introduced service-to-service auth, request signing, and granular scopes to contain data sharing.
Healthcare
FHIR search exploitation
Tested crafted search parameters that bypassed consent filters to enumerate patient encounters.
Outcome
Tightened search validators, enforced consent checks at query time, and added anomaly monitoring.
Fintech
Mass assignment in onboarding API
Identified hidden fields that let attackers flag accounts as verified during signup.
Outcome
Locked down model binding, validated allowed fields, and added anti-automation controls.
Testing Methodology
1
Scoping & Kick-off
Define objectives, scope, and constraints, aligning expectations, testing approach, and deliverables during a structured kick-off meeting.
2
Reconnaissance
Gather information about exposed endpoints, authentication methods, and technologies through passive research and active discovery for a complete API surface map.
3
Scanning & Vulnerability Identification
Combine automated scans with manual verification to uncover misconfigurations, injection flaws, and logic vulnerabilities, following OWASP API Security Top 10 principles.
4
Exploitation
Safely validate confirmed weaknesses with proof-of-concept attacks to demonstrate real business impact without disrupting production systems.
5
Reporting & Debrief
Deliver a detailed report including an executive summary, scope, methodology, prioritized findings with PoCs, risk ratings, and actionable remediation, followed by a restitution meeting.
6
Retest (Optional)
Ensure all identified vulnerabilities have been properly fixed without introducing new risks.
FAQ
- Staging or pre-production environment preferred (production testing possible with coordination).
- At least two test accounts per user role (admin, manager, user).
- Provide API documentation, credentials, and test data if available.
- Whitelist our IPs to prevent WAF or IPS interference.
- Use dummy or anonymized data for safe testing.
APIs often expose far more than intended, from sensitive data to hidden business logic. Attackers target these weaknesses to gain unauthorized access, pivot inside systems, or exfiltrate information. This assessment identifies and validates these risks before they can be exploited.
Duration depends on API size and complexity:
- Small (≤25 endpoints): 2–4 business days
- Medium (≤200 endpoints): 5–10 business days
- Large / complex (≥200 endpoints): 10–20 business days
Testing is safe and non-destructive. For production environments, test windows are coordinated to minimize impact. Potentially disruptive actions are performed only with prior agreement.