API PENETRATION TESTING
Your API trusts the caller. It shouldn’t.
REST, GraphQL and gRPC, tested for the object-level authorization and business logic flaws that scanners cannot reach.
APIs now carry most application traffic, and a growing share of the risk.
COVERAGE
What a api pentest covers
Every item below is tested by hand, not just scanned. Nothing here is a checkbox exercise.
- Broken object-level authorization (BOLA / IDOR)
- Broken authentication
- Excessive data exposure
- Lack of rate limiting
- Mass assignment
- Broken function-level authorization
- Server-side request forgery via API
- Improper inventory (shadow / zombie endpoints)
- GraphQL-specific abuse
WHY IT MATTERS
What this stops before it happens.
These are the outcomes we are actually testing for. Not theory, these are the paths we take on real engagements.
Cross-tenant data access
Object-level authorization gaps let one customer read another’s data.
PII scraping
Over-exposed responses let attackers harvest personal data at scale.
Endpoint abuse
Missing rate limits let attackers brute-force and abuse business logic.
THE DELIVERABLE
A report you can act on, not a wall of scanner output.
- Executive summary for leadership
- Every finding with CVSS 3.1, proof and business impact
- Step-by-step remediation per issue
- Prioritised remediation roadmap
- Free retest of every fixed finding
BOLA → cross-tenant data access
Changing an object ID returned records belonging to other tenants.
HOW IT RUNS
Six phases, no surprises.
- 01ScopeTargets, access and rules of engagement, agreed in writing.
- 02ReconMap the real attack surface the way an attacker would.
- 03ExploitManual, hands-on testing. Flaws chained, impact proven.
- 04ReportCVSS, proof, business impact and a concrete fix per finding.
- 05RemediateWe support your engineers through every fix.
- 06RetestEvery fixed finding re-tested, at no extra cost.
FAQ
Questions we get about api pentest
What do you need to test an API?
API documentation, an OpenAPI/Postman collection if available, and auth tokens for each role. If docs are thin, we’ll help map the surface.
Do you test production or staging?
Either. We prefer staging for anything potentially disruptive and coordinate carefully when testing production.
Can you test GraphQL and gRPC?
Yes. We test REST, GraphQL and gRPC, including GraphQL-specific abuse like introspection and query batching.
What standards do you follow?
The OWASP API Security Top 10 within a PTES-aligned process.
What happens after the report?
You get a prioritized remediation roadmap and a free re-test of fixed findings.
READY WHEN YOU ARE
Scope your api pentest.
Tell us what you want tested. You get an honest scope, a firm timeline and a fixed quote, with no obligation.