API and Backend Security Hub
A hub for SaaS tenant isolation, API authorization, JWT/session design, rate limits, fintech APIs, queues, Kafka, and backend abuse cases.
Cross-tenant data access caused by weak object authorization.
JWT treated as authorization instead of only a credential carrier.
API cost abuse that becomes a security and finance incident together.
Built For
Backend teams shipping APIs with role, tenant, and payment complexity.
SaaS founders and CTOs validating isolation before enterprise sales.
Security teams testing authorization beyond endpoint-level scanning.
Use Cases
Test tenant isolation, BOLA/IDOR, role boundaries, and object ownership.
Review JWT, session, refresh token, webhook, and provider integration security.
Model cost abuse, bot pressure, queue poisoning, and event-streaming failure modes.
Related Content
Related Advisories
Frequently Asked Questions
Why is tenant isolation a security test?
Because a single missed ownership check can expose another customer’s records, invoices, files, or admin actions.
Is API security only OWASP API Top 10?
No. OWASP is a baseline; real API testing also needs business logic, abuse economics, tenancy, async jobs, and integration review.
Need help validating this attack surface?
Talk with Eresus Security about scoped testing, threat modeling, and remediation priorities for this workflow.
Talk to Eresus