API Security Assessments

API Security Assessments That Stop Breaches Before They Start

APIs connect everything—from cloud apps to customer data. They also represent one of today’s most exploited attack surfaces. eSureITy’s API Security Assessment identifies vulnerabilities across your connected ecosystem—so you can mitigate risk before it turns into a breach or insurance claim.

Why API Security Matters to Cyber Insurers

APIs now move more sensitive data than web browsers, and that data is increasingly under attack. A single exposed endpoint can give threat actors access to customer records, intellectual property, and payment data—triggering costly data breach investigations and insurance claim disputes.

Weak authentication, overprivileged tokens, and unvalidated inputs are among the most common root causes of API-related claims. For organizations operating under HIPAA, PCI DSS, or NIST 800-53, these gaps also represent compliance violations that can void coverage.

eSureITy’s API Security Assessments provide documented evidence of due diligence—proving your organization’s control maturity to regulators and underwriters alike.

Hidden Vulnerabilities in the Cloud Supply Chain

Modern business applications rely on a sprawling web of APIs—many built from third-party code or legacy integrations never designed with today’s threat landscape in mind.
Attackers exploit:

  • Broken Authentication & Authorization: Insecure tokens or session flaws that allow data access without consent.
  • Logic Flaws in Microservices: Workflow bypasses that expose customer data or transaction details.
  • Open-Source Component Risks: Unpatched libraries reused across hundreds of APIs.
  • AI-Powered Exploitation: Automated scanners testing millions of endpoints for known injection points.

When these weaknesses go unchecked, they don’t just expose data—they expose your organization to liability, reputation damage, and coverage disputes.

Insurance-Ready API Security Testing

eSureITy combines automated scanning, fuzzing, and human-driven penetration testing to uncover vulnerabilities across your API ecosystem. Each assessment is mapped to OWASP API Top 10, NIST 800-53, and CIS Benchmarks, ensuring alignment with both regulatory and insurance requirements.

Our Assessment Methodology Includes:

  • Discovery & Mapping — Inventory of documented and shadow APIs, including endpoints, dependencies, and authentication flows.
  • Authentication & Authorization Testing — Validation of OAuth/OIDC tokens, API keys, and session management controls.
  • Data Validation & Injection Testing — Fuzzing of input fields, JSON bodies, and headers for injection and deserialization vulnerabilities.
  • Error & Exception Handling Review — Identification of verbose error responses revealing stack traces or internal data.
  • Logging & Monitoring Audit — Verification that API gateways record, alert, and retain critical events.
  • Encryption & Certificate Validation — Evaluation of TLS configurations, certificate pinning, and payload encryption.
  • Business Logic Exploitation Simulation — Real-world testing to identify privilege escalation and cross-tenant data exposure.

Every finding is risk-ranked using CVSS, assigned a business impact score, and mapped to mitigating OWASP and NIST controls for insurer-recognized documentation.

Deliverables That Strengthen Compliance and Coverage

API Risk Report (PDF + Dashboard)
  • OWASP API Top 10 compliance summary
  • Detailed vulnerability list with business impact scoring
  • Evidence-based documentation for insurers and auditors
Remediation & Governance Plan
  • Prioritized corrective actions mapped to compliance frameworks
  • Integration with ticketing systems (Jira, ServiceNow) for tracking progress
  • Policy updates for authentication, access control, and data validation
Retest & Verification
  • Validation remediation activities
  • Continuous monitoring options available for quarterly assurance
Measurable Results
  • 70% fewer exploitable endpoints after first remediation sprint
  • 100% fix verification through retesting
  • Zero critical OWASP API Top 10 gaps within 90 days of follow-up audit
Key Security Tests We Perform

Test

Purpose

Authentication

Verify tokens, MFA, and OAuth/OIDC scopes to block stolen credential replay.

Authorization

Test BOLA/BOPLA flaws to detect privilege escalation and cross-tenant data access.

Session Management

Review cookie flags, token refresh logic, and revocation to prevent hijacking.

Data Validation

Fuzz inputs for injections, overflows, and deserialization attacks.

Error Handling

Trigger verbose errors to detect exposed stack traces and system metadata.

Logging & Monitoring

Validate gateway logging and real-time alerting of anomaly patterns.

Encryption

Confirm strong TLS configurations, payload encryption, and replay protection.
Why Choose eSureITy?
  • Cyber Insurance Alignment: Reporting structured to meet insurer risk evaluation and renewal documentation.
  • Certified API Testers: CISSP, CEH, OSCP, AWS, and Kubernetes-certified engineers.
  • Continuous Assurance: Retesting, managed monitoring, and incident response readiness.
  • Proven Methodology: Mapped to OWASP, NIST 800-53, and CIS standards.
  • Cross-Industry Expertise: Securing APIs across healthcare, finance, manufacturing, and SaaS providers.
  • End-to-End Support: From assessment through mitigation and compliance validation.

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