🌐 CloudCSF – Day 28
Control #27: Shadow API Exposure – What You Don’t See Can Hurt You
“Not all APIs are documented. But attackers find them anyway.”
😱 What Are Shadow APIs?
Shadow APIs are:
- APIs created by developers but not registered or documented
- Legacy APIs no longer in use but still reachable
- APIs left exposed after migration or dev/test cycles
These APIs are invisible to the security team but exploitable by attackers.
🔓 Real-World Risks
| Shadow API Flaw | Risk |
|---|---|
| No auth/token check | Full data exposure |
| Exposes internal logic | Enumeration, abuse |
| Unpatched API version | RCE or injection |
| Accepts undocumented input | Bypass rules or validation |
🛠️ CloudCSF Audit Checklist
🔍 Discover & Monitor
- Run API inventory tools like Traceable, Salt, Noname, Akto
- Scan API gateways for unmapped endpoints
- Compare deployed APIs vs known documentation (Swagger/OpenAPI)
✅ Secure Shadow APIs
- Block or deprecate unused endpoints
- Enforce standard authentication on all APIs
- Integrate with API gateway policies to track and control all traffic
📊 Tools:
- APIsec, OWASP APISecurity Top 10, Postman Security Scans
- Cloudflare API Shield, AWS WAF + API Gateway Logging
🧠 CloudCSF Maturity Index – API Exposure
| Level | Description |
|---|---|
| 🔴 L0 | APIs discovered after breach |
| 🟠 L1 | Manual inventory, no alerting |
| 🟡 L2 | Logs + alerting enabled |
| 🟢 L3 | Full discovery, auth enforced |
| 🔵 L4 | Automated posture scoring + blocking |
📥 Download Now
📊 CI/CD Pipeline Risk Audit Template (Excel)
📄 Shadow API Audit Template — Coming Next Post!
🗓️ Coming Tomorrow
Day 29 – Control #28: Orphaned Cloud Resources – Attack Surface You Forgot Exists
Shadow APIs, API Security Audit, OWASP API Top 10, Undocumented APIs, Cloud API Inventory, API Threat Detection, API Gateway Security, API Discovery Tools, Hidden API Risks, API Attack Surface