API Security Testing
APIs are now the primary attack surface of modern applications. We map them, attack them and harden them.
The front door attackers prefer
Mobile apps, SPAs, partner integrations and microservices all speak through APIs. They frequently expose more data than the UI ever shows, and they are rarely tested as thoroughly as the web front end.
OWASP API Top 10 — and beyond
Broken Object Level Authorization
BOLA / IDOR across every object referenced by an identifier.
Broken Authentication
Token handling, credential flows, session and API-key weaknesses.
Broken Object Property Level Authorization
Mass assignment and excessive data exposure.
Unrestricted Resource Consumption
Missing rate limits, pagination abuse and resource exhaustion.
Broken Function Level Authorization
Admin/privileged functions reachable by lower-privilege users.
Unrestricted Access to Sensitive Business Flows
Automated abuse of business processes.
Server Side Request Forgery
Outbound request abuse and internal network access.
Security Misconfiguration
CORS, verbose errors, unnecessary methods and exposed docs.
Improper Inventory Management
Shadow, deprecated and versioned endpoints left exposed.
Unsafe Consumption of APIs
Trust placed in third-party API responses.
Token analysis
Algorithm confusion, weak secrets, missing expiry and claim abuse.
Authorization flows
Redirect handling, scope escalation, state and PKCE misuse.
Josh API Analyzer
For API-heavy engagements we use our own purpose-built testing platform — 25 selectable detectors aligned to the OWASP API Top 10, a repeater for manual verification, Intruder-style fuzzing, JWT decoding and structured reporting.
- Capture traffic from browser, app or HAR file
- BOLA/IDOR, BFLA, SQLi, XSS, SSRF, JWT & logic detectors
- Repeater and four fuzzing modes for verification
- Executive & technical reports (JSON, CSV, XML, HTML)
Have an API that needs testing?
Share your API documentation or a Postman collection and we will scope a focused assessment.