Most modern apps are a front end on top of APIs. If endpoints leak data or skip permission checks, every customer is at risk. We test APIs the way attackers abuse them — then deliver a clear report.
Find broken access rules before one user reads another company's records.
Validate partner connections and mobile backends before production traffic.
Show auditors structured API testing — not a generic scan export.
Catch weak tokens, missing rate limits, and logic flaws that enable takeover.
CERT-In empanelled · India
Sumrite’s testers run your API security testing by hand, and the report is issued through a CERT-In empanelled auditor. One team from scoping to sign-off, built for Indian regulators, enterprise buyers and government work.
Yes. We run the full engagement for you and route the formal attestation through our network of CERT-In empanelled partner auditors, so you deal with one team from scoping to report.
API security testing is an expert-led assessment of the endpoints your web app, mobile app and partners call behind the scenes. Most serious API flaws are not visible in the interface: the screen only shows your own records, but the endpoint behind it may return anyone's if the ID in the request is changed. A tester maps the endpoints, signs in as different users and roles, then replays, alters and reorders requests to see what the server allows. The work follows the OWASP API Security Top 10, with particular attention to broken object-level authorisation, broken authentication, excessive data exposure and missing rate limits. REST and GraphQL are both covered. Each confirmed issue comes with the exact request that proves it, its severity and the server-side fix. For a scoped API, Sumrite delivers the report within 48 hours of testing starting, with re-testing of fixes included.
| OWASP API risk | What Sumrite tests |
|---|---|
| API1 Broken object level authorization | Every object identifier swapped across users and tenants |
| API2 Broken authentication | Token handling, JWT signing and expiry, OAuth flows, credential stuffing controls |
| API3 Broken object property level authorization | Excessive data in responses and mass assignment of protected fields |
| API4 Unrestricted resource consumption | Rate limits, pagination limits, GraphQL depth and batching abuse |
| API5 Broken function level authorization | Admin and privileged functions called as a normal user |
| API6 Unrestricted access to sensitive business flows | Sign-up, checkout, voucher and booking flows abused at scale |
| API7 Server side request forgery | URL parameters and webhooks that make the server fetch internal resources |
| API8 Security misconfiguration | CORS, verbose errors, headers, TLS and default settings |
| API9 Improper inventory management | Old API versions, shadow and undocumented endpoints still live |
| API10 Unsafe consumption of APIs | Trust in data returned by third-party APIs your service calls |
Read next: API penetration testing checklist (OWASP API Top 10)
| Area | What we check | Example finding |
|---|---|---|
| Object-level authorisation | Whether changing an ID returns another user's or tenant's data | GET /orders/1043 returns a different customer's order |
| Authentication | Token issue, expiry, refresh, revocation and key handling | A JWT accepted after the user has logged out |
| Function-level access | Admin and internal endpoints reachable by ordinary users | A normal account can call the user-delete endpoint |
| Data exposure | Fields returned that the client never displays | Password hashes and emails in a list response |
| Abuse controls | Rate limits, enumeration and resource exhaustion | Unlimited one-time-code attempts on login |
A base URL for a test environment, documentation if it exists (OpenAPI, Postman or GraphQL schema), and at least two accounts per role so cross-user access can be tested. Without documentation we map the API from the app's traffic.
Yes. GraphQL testing adds introspection, query depth and batching abuse, and field-level authorisation on top of the usual authentication and access checks.
Testing is done against agreed accounts and data, preferably in staging. Destructive actions are only performed on records we create, and the rules are agreed in writing first.
We run the full engagement for these frameworks, and where a formal audit or attestation is needed we route it through our local partner firms, so you deal with one team.
Breaches often start with a changed ID in a URL, an admin function open to normal users, or a mobile app returning more data than the screen shows.
Sumrite's API Security Testing maps important endpoints, tests who can access what, and proves issues with real requests verified by researchers.
Methodology, scope, and deliverables in plain terms.
Aligned to OWASP API Security Top 10: authorization at object and function level, excessive exposure, mass assignment, and resource abuse.
Prioritised findings, reproduction steps, HTTP traces, and remediation guidance. Report on standard scopes within 48 hours.
Every step from scope and NDA to a retested, final report, shown for API Security Testing. No jargon, no surprises.
Submit your scope so our team can plan the engagement and get started.
Every phase is run by a security expert, with tools used only to speed up the routine parts. Findings are reproduced and confirmed before they reach your report.
Findings are written for two readers at once: developers who need the exact fix and auditors or buyers who need confidence.
Your team fixes the issues with guidance written for your stack, and the tester who found each issue answers questions directly.
Every fix is tested again. Nothing is marked closed on trust.
You receive a verified report in your company name, ready for clients, auditors and procurement.
Share your API URL or OpenAPI spec. We respond shortly.
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