🔒 Paid
CORS Misconfiguration Blocks Partner Integrations
A security-hardening change tightens your CORS policy to internal origins only. Your own web app looks completely fine — but every legitimate third-party partner integration starts failing with browser preflight rejections. Rotating partner API keys does nothing. Restarting the integration service does nothing. Opening CORS to any origin 'fixes' the error rate but reopens your API to the entire internet. Diagnose why a legitimate security change broke a legitimate caller, and restore partner access without undoing the hardening.
- Difficulty
- Senior
- Expected Time
- ~15 min
- Category
- Security & Identity
Skills
- Recognizing when a legitimate security change is the root cause
- Distinguishing browser-enforced CORS rejection from application-layer failures
- Rejecting a superficial fix that trades security for availability
- Scoping a remediation to the specific legitimate callers affected
System Architecture
- Internal Web App
- Partner API Gateway
- CORS Policy Enforcer
- Partner Integration Service
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