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Active Defense: Introducing Cloudflare’s Stateful API Vulnerability Scanner

10 March 2026 by
Suraj Barman

Cloudflares stateful scanner actively probes APIs to uncover logic‑level flaws that traditional firewalls miss, starting with Broken Object Level Authorization (BOLA) detection.

Stateful Scanning Engine

The engine records request sequences and replays them with mutated parameters to verify authorization checks. It combines passive traffic knowledge with active probing for reliable detection.

  • Tracks session state across multiple API calls
  • Generates payload variations based on OpenAPI schemas
  • Validates responses against expected status codes and error messages
  • Logs findings in real time for immediate review
  • Supports custom authentication flows via token injection

API Discovery & Schema Learning

Cloudflare automatically maps endpoints and learns parameter patterns from live traffic, reducing manual setup. This knowledge fuels both passive detection and active scan planning.

  • Passive cataloging of endpoints from edge traffic
  • Automatic inference of required headers and query parameters
  • Correlation of request‑response pairs to build usage models
  • Option to upload OpenAPI specs for faster onboarding
  • Continuous learning to adapt to API version changes

Integration with Security Insights

Scan results appear alongside existing Cloudflare findings, giving analysts a unified view of threats. Contextual data helps prioritize remediation.

  • Unified dashboard merges scanner alerts with WAF and bot‑management events
  • Risk scores incorporate frequency and impact of detected flaws
  • Exportable reports compatible with SIEM tools
  • Tagging system links findings to specific API endpoints
  • Direct links to remediation guidance in the Cloudflare docs

User Workflow & Scan Configuration

Customers provide API credentials and optional OpenAPI files the platform then builds a tailored scan plan. The process requires minimal manual effort.

  • Upload or reference OpenAPI specification
  • Enter API keys or OAuth tokens for authenticated scans
  • Select scan scope (single endpoint, service, or full API)
  • Review auto‑generated test cases before launch
  • Monitor progress and view results in the Cloudflare console

For a deeper look at API discovery, see our internal guide building a scalable real‑time payment orchestration framework. Learn more about the OWASP API Top 10, including BOLA, on Wikipedia.