API Security Assessment
Comprehensive API security testing - REST, GraphQL, SOAP, gRPC, and WebSocket. Authentication bypass, authorization flaws, rate limiting, injection attacks, and business logic testing across your entire API surface.
Why API Security Assessment Matters
Every organization faces these critical risks. Without proper assessment, these vulnerabilities become attack vectors for adversaries.
Broken Object Level Authorization (BOLA)
The #1 API vulnerability - attackers manipulating object IDs to access other users' data. We test every endpoint for horizontal and vertical privilege escalation across all user roles.
Authentication & Token Vulnerabilities
Weak JWT implementation, insecure OAuth flows, missing token rotation, and API key exposure. We test your authentication chain from initial login to token lifecycle management.
Excessive Data Exposure
APIs returning more data than needed, exposing PII, internal IDs, and sensitive fields in responses. We audit every response payload against the principle of least privilege.
Rate Limiting & Resource Abuse
Missing or bypassable rate limits enabling brute force, enumeration, and denial-of-service attacks. We test throttling mechanisms under realistic attack conditions.
Injection Attacks (SQL/NoSQL/GraphQL)
Parameter injection across REST parameters, GraphQL queries, and NoSQL operators. We test for SQLi, NoSQLi, GraphQL injection, and command injection across all input vectors.
Mass Assignment & Parameter Tampering
Attackers modifying unintended parameters in API requests to escalate privileges, change prices, or manipulate business logic without proper server-side validation.
What We Assess
A comprehensive, methodical evaluation covering every critical surface area.
Deep-Dive Coverage - Every Nuance Addressed
API Security Assessment isn't one-size-fits-all. Different contexts demand different assessment approaches. We go beyond generic checklists to address the specific attack surfaces and risks of each domain.
API Authorization Graph Analysis
API risk is dominated by object-level and function-level authorization defects that are invisible to shallow testing. The assessment maps trust relationships across resources, methods, services, and tenants to expose exploitable authorization drift.
- ▸ BOLA across nested resource identifiers, parent-child objects, and secondary references exposed in mobile or partner APIs
- ▸ BFLA on undocumented admin routes, debug verbs, and internal-only actions still reachable through the gateway
- ▸ JWT audience, issuer, and scope confusion between microservices with inconsistent validation libraries
- ▸ mTLS or gateway-offloaded authentication trust boundary failures in downstream services
- ▸ Tenant isolation breaks caused by shared cache keys, weak row filters, or insecure resource scoping
Schema Drift & Shadow API Discovery
High-risk API exposure often lives outside the official specification in deprecated routes, partner integrations, or developer leftovers. This domain validates whether the documented contract actually matches the reachable attack surface.
- ▸ Deprecated version endpoints still exposed behind the API gateway after production cutover
- ▸ GraphQL schema recovery from persisted queries, error messages, and client bundle artifacts even when introspection is disabled
- ▸ gRPC reflection, protobuf descriptor leakage, and unauthorized method discovery in service meshes
- ▸ Mismatch between OpenAPI definitions and live parameter behavior leading to untested attack paths
- ▸ Forgotten staging, canary, or beta endpoints recoverable from mobile binaries and frontend code
Input Parsing & Protocol Abuse
Modern APIs fail not only at business logic but also at parsing boundaries between clients, gateways, and upstream services. Testing focuses on parser ambiguity, coercion issues, and protocol-level behavior that changes enforcement outcomes.
- ▸ JSON number coercion and type confusion leading to authorization, pricing, or rate-limit bypass
- ▸ Mass assignment through automatic object binders and unsafe PATCH or merge semantics
- ▸ XXE and entity expansion exposure in legacy XML or SOAP integration endpoints
- ▸ HTTP/2 abuse including rapid reset exhaustion and header normalization inconsistencies
- ▸ Request smuggling between API gateways, service meshes, and origin services
Event-Driven & Supply Chain Security
API ecosystems increasingly depend on webhooks, asynchronous queues, and third-party integrations, all of which expand trust far beyond a single endpoint. This domain validates authenticity and replay resistance.
- ▸ Webhook replay through weak timestamp, nonce, or canonicalization validation
- ▸ HMAC signature verification flaws caused by body transformation or header ambiguity
- ▸ Queue poisoning and downstream consumer abuse through malformed asynchronous events
- ▸ Third-party OAuth application over-privileging and token misuse across connected services
- ▸ Rate-limit evasion using distributed API keys or protocol multiplexing
Assessment Process
A structured, repeatable methodology delivering consistent, high-quality results across every engagement.
Deepen Your API Security Knowledge
Download our comprehensive resources to understand our methodology and share insights with your stakeholders.
Standards & Frameworks We Cover
Why Choose Us for API Security Assessment
India's Only CREST-Approved for VA & PT
International gold standard in security testing - the only Indian company with dual CREST accreditation for both Vulnerability Assessment and Penetration Testing.
Vulnerabilities Discovered
Proven track record across 5,500+ assessments. Every finding is manually validated with proof-of-concept - zero false positives.
Real-Time Project Portal
Track assessment progress, view findings, and collaborate with our team through our proprietary LURA platform. Security Simplified.
API Security Assessment FAQs
How long does the API Security Assessment take?
Typically 1-3 weeks depending on scope and complexity. We provide a detailed timeline during the scoping phase based on your specific environment and requirements.
Will the assessment affect our production systems?
We use carefully controlled, non-destructive testing techniques for production environments. For invasive tests, we coordinate timing with your team and can test on staging environments.
What certifications do your testers hold?
Our team holds OSCP, CREST CRT, CEH, CISSP, and CISM certifications. Briskinfosec is CREST-approved for both Vulnerability Assessment and Penetration Testing - the only Indian company with this dual accreditation.
Do you provide re-testing after remediation?
Yes. We include one round of complimentary re-testing within 90 days to validate all findings have been properly remediated. The re-test report is provided through our LURA portal.
What deliverables do we receive?
You receive a comprehensive report with executive summary, detailed technical findings with CVSS scores, proof-of-concept demonstrations, risk-prioritized remediation guidance, and access to our LURA portal for ongoing tracking.
Secure Your APIs Today
Talk to our CREST-certified security experts today. Free scoping call, no obligation.
Or email us at contact@briskinfosec.com