Find the flaws in yourAPI attack surface.Before adversaries weaponize them.
Manual adversarial testing of REST, GraphQL, gRPC, and WebSocket APIs. Full OWASP API Top 10 coverage with business logic exploitation, authentication bypass, and authorization testing.
APIs are the
new attack surface.
APIs have become critical infrastructure for modern applications, connecting systems, enabling integrations, and handling sensitive operations. Yet many organizations overlook the unique vulnerabilities that plague API architectures — from broken authorization to data exposure and business logic abuse.
Authentication Testing
OAuth 2.0, JWT, API keys, mTLS, and custom auth mechanisms
Authorization Testing
RBAC, ABAC, attribute injection, and privilege escalation
Business Logic Testing
Workflow abuse, state manipulation, and constraint bypassing
Input Validation
Type confusion, buffer overflows, and injection attacks
Common API Vulnerabilities
These vulnerabilities are widespread across enterprise APIs. Our testing finds them before attackers weaponize them.
Broken Object Level Authorization (BOLA)
Attackers modify object IDs to access other users' resources without proper authorization checks.
91% of APIs vulnerable
Broken Authentication
Weak token validation, improper session management, and credential storage vulnerabilities.
87% of APIs affected
Excessive Data Exposure
APIs returning excessive data fields, enabling information disclosure and PII leakage.
79% of APIs overshare
Lack of Rate Limiting
Missing or ineffective rate limiting enables brute force attacks, DoS, and bulk data extraction.
85% vulnerable
Broken Function Level Authorization
Admin functions accessible by regular users due to missing privilege checks.
94% have flaws
Mass Assignment
APIs accept unintended parameters, allowing attribute injection and privilege escalation.
88% vulnerable
API Testing Methodology
Our six-phase testing approach ensures comprehensive coverage of all API security domains.
Discovery
Map API endpoints, identify supported methods, and discover hidden endpoints.
Endpoints found
HTTP methods
Hidden resources
OWASP API Top 10
Every engagement validates the full OWASP API Security Top 10 — click any risk to see attack vectors and real-world impact.
Click any risk card to reveal attack vectors and business impact
AI Accelerates API Testing
Our testers leverage AI-powered tools to accelerate endpoint discovery, analyze API schemas, optimize test case generation, and identify vulnerabilities faster.
Why Spakto for API Security
API-Specific Expertise
Specialists in REST, GraphQL, gRPC, and emerging API architectures.
Business Logic Focus
Deep understanding of workflows, state machines, and constraint bypassing.
Rapid Turnaround
48-hour reports with prioritized findings and clear remediation paths.
Continuous Coverage
Retesting partnerships ensure fixes are effective and vulnerabilities don't regress.
Secure Your APIs Today
Schedule a comprehensive API penetration test with our specialists to identify and remediate vulnerabilities before they're exploited.
Frequently Asked Questions
Frequently asked
questions.
answered
Our API penetration tests validate against OWASP API Security Top 10, covering broken object level authorisation, authentication flaws, excessive data exposure, rate limiting gaps, function-level authorisation issues, mass assignment, security misconfiguration, injection vulnerabilities, improper asset management, and insufficient logging.
We work with your team to establish dedicated test credentials and a safe testing window. All destructive operations are explicitly scoped out, and we use isolated test environments wherever possible to prevent any impact on production data or availability.
Scope determines timeline. A focused assessment of a single API can complete in 3-5 days. Comprehensive testing of a complex microservices architecture with dozens of APIs typically requires 2-4 weeks. We provide detailed scoping after reviewing your API documentation.
Yes. We test REST, GraphQL, gRPC, WebSocket, and SOAP APIs. Each protocol has unique attack surfaces — GraphQL introspection abuse, gRPC reflection attacks, and WebSocket authentication gaps require protocol-specific testing approaches.
Broken Object Level Authorisation (BOLA) allows attackers to access resources they don't own by manipulating object IDs in API calls. It's the #1 OWASP API risk because it's trivially exploitable, extremely common, and often exposes entire databases of customer records through simple ID enumeration.