API security for CISOs

What middleBrick covers

  • Quantify API risk with letter grades and prioritized remediation
  • Black-box scanning with no agents or code access required
  • Coverage aligned to OWASP API Top 10 (2023), PCI-DSS 4.0, SOC 2
  • LLM adversarial probes across Quick, Standard, and Deep tiers
  • Continuous monitoring with diff detection and configurable alerts
  • CI/CD integration via GitHub Action and MCP server support

Executive risk quantification

CISOs need a concise view of API risk that ties to business exposure. The scanner assigns a single letter grade from A to F per API surface and ranks findings by severity and ease of exploitation. Risk scores are derived from attack feasibility, data sensitivity, and the potential impact on confidentiality, integrity, and availability.

Each finding includes a standardized identifier, a brief description, and prioritized remediation steps. The system maps findings to PCI-DSS 4.0, SOC 2 Type II, and OWASP API Top 10 (2023), enabling you to align audit evidence collection with established control frameworks. Reports highlight which controls are validated and where compensating controls may be required.

Black-box coverage without code access

Because many APIs are distributed across teams and clouds, the scanner operates as a black-box solution with no agents, SDKs, or code access. It supports any language, framework, or cloud deployment and completes most scans in under a minute using read-only methods plus text-only POST for LLM probes.

  • Authentication support for Bearer tokens, API keys, Basic auth, and cookies, gated by domain verification to ensure only domain owners can scan with credentials.
  • Read-only HTTP methods reduce operational risk while still exercising validation and business logic paths.
  • Header allowlist policy limits forwarded headers to Authorization, X-API-Key, Cookie, and X-Custom-* headers to minimize unintended side effects.

The OpenAPI parser resolves recursive $ref across OpenAPI 3.0, 3.1, and Swagger 2.0, cross-referencing spec definitions against runtime behavior to surface undefined security schemes, deprecated operations, and missing pagination.

Detection aligned to top API risks

The scanner covers 12 categories aligned to OWASP API Top 10 (2023) and related compliance considerations, focusing on the most prevalent issues CISOs face in production APIs.

  • Authentication bypass and JWT misconfigurations such as alg=none, weak signing keys, expired tokens, and missing claims.
  • Broken Object Level Authorization (BOLA) and IDOR via sequential ID enumeration and adjacent ID probing.
  • Broken Function Level Authorization (BFLA) and privilege escalation through exposed admin endpoints and role/permission leakage.
  • Property authorization issues including over-exposure of internal fields and mass-assignment surface.
  • Input validation faults such as dangerous HTTP methods, wildcard CORS with credentials, and debug endpoints.
  • Rate limiting and resource consumption risks identified through missing rate-limit headers and oversized responses.
  • Data exposure patterns including emails, Luhn-validated card numbers, context-aware SSNs, and API key formats.
  • Encryption gaps like missing HTTPS redirects, absent HSTS, and insecure cookie flags.
  • SSRF indicators such as URL-accepting parameters, internal IP detection, and active bypass probes.
  • Inventory management issues including missing versioning and legacy path patterns.
  • Unsafe consumption surfaces from excessive third-party URLs and webhook/callback endpoints.
  • LLM and AI Security with multi-tier adversarial probes targeting prompt extraction, jailbreaks, data exfiltration, and token smuggling.

Continuous monitoring and integration

For ongoing risk management, the Pro tier enables scheduled rescans every 6 hours, daily, weekly, or monthly. Diff detection highlights new findings, resolved findings, and score drift so leadership can track trend lines rather than isolated snapshots.

Email alerts are rate-limited to one per hour per API to avoid noise, while HMAC-SHA256 signed webhooks deliver structured events with auto-disable after 5 consecutive failures. Integration options include a CLI for on-demand scans, a GitHub Action that gates CI/CD when scores drop below your threshold, and an MCP server for AI-assisted development workflows.

Enterprise tiers support custom rules, SSO, detailed audit logs, an SLA, and dedicated support. All scan data is deletable on demand and purged within 30 days of cancellation, with explicit guarantees that data is never sold or used for model training.

Scope, limitations, and compliance framing

It is important to understand what the scanner does and does not do. It detects and reports with remediation guidance, but it does not fix, patch, block, or remediate issues automatically. It does not perform active SQL injection or command injection testing, as those methods fall outside the read-only scope. Business logic vulnerabilities require human expertise and are out of scope, and blind SSRF relies on out-of-band infrastructure that is not evaluated.

The tool does not replace a human pentester for high-stakes audits. For compliance, it helps you prepare for audits by surfacing findings relevant to PCI-DSS 4.0, SOC 2 Type II, and OWASP API Top 10 (2023). It aligns with security controls described in other frameworks and supports audit evidence collection, but it is not a certification or compliance guarantee for HIPAA, GDPR, ISO 27001, NIST, CCPA, or any other regulation.

Frequently Asked Questions

How are risk scores calculated?
Scores combine exploitability, data sensitivity, and potential impact on confidentiality, integrity, and availability. The resulting letter grade reflects the overall risk posture of each API endpoint.
Can authenticated scans access protected endpoints?
Yes, authenticated scanning with Bearer tokens, API keys, Basic auth, or cookies is supported, provided the domain ownership is verified via DNS TXT or HTTP well-known file.
What is the scope of LLM security testing?
The scanner runs 18 adversarial probes across three scan tiers to test system prompt extraction, instruction override, jailbreaks, data exfiltration, and token smuggling without sending destructive payloads.
How are compliance mappings handled?
Findings map directly to PCI-DDS 4.0, SOC 2 Type II, and OWASP API Top 10 (2023). For other frameworks, the scanner supports alignment and evidence gathering but does not claim compliance.
What happens to scan data after cancellation?
Customer data is deletable on demand and purged within 30 days of cancellation. It is never sold and is not used for model training.