01 / Input
Understand your environment
Authorization model and enforcement points (resources, actions, invariants).
Services / Security
API Security Review: BOLA, IDOR & Tenant Isolation
If an API trusts the wrong input or checks permissions in the wrong place, a small mistake can affect a lot of users. We review those decisions, reproduce problems where authorized and help fix them in the service itself.
EXPLORE THE COMPLETE SERVICE
Backend & Cloud Engineering
Secure systems that behave when the happy path ends.
Assessment method
Authorization rules are spread across services and are not enforced consistently.
A scoped security engineering review of backend APIs and service boundaries. We focus on authorization correctness, multi-tenant isolation, abuse controls, and operational signal needed to investigate failures.
01
Boundary to inspect
Authorization rules are spread across services and are not enforced consistently.
02
Test execution
Authorization model and enforcement points (resources, actions, invariants).
03
Evidence to capture
Findings memo with concrete reproduction notes where appropriate.
Test plan
Testing and deliverables
Security testing coverage
- Authorization model and enforcement points (resources, actions, invariants).
- Multi-tenant isolation and data boundary review.
- Input validation and risky parsing boundaries in scope.
- Replay protection, idempotency, and webhook signature validation.
- Audit logs and instrumentation tied to investigation and triage.
Findings and remediation
- Findings memo with concrete reproduction notes where appropriate.
- Abuse-case and bypass matrix for critical workflows in scope.
- Prioritized remediation roadmap with sequencing guidance.
- Validation checklist and retest criteria for high-risk fixes.
Synthetic examples
Engineering in practice
Sample security findings and reports
Fictional examples showing how we organize security findings and fixes.
Explore ProjectsHOW THE WORK IS DELIVERED
Expertise you can put to work.
Explore how our engineering and security work moves from discovery to implementation, testing and delivery.
02 / Verification
Investigate and implement
Multi-tenant isolation and data boundary review.
03 / Output
Deliver practical results
Findings memo with concrete reproduction notes where appropriate.
Example deliverable structure
Clear findings. Practical next steps.
01Affected component & scope
02Observed behavior and reproduction
03Impact, preconditions and limits
04Correction, owner and retest
Frequently Asked Questions
Answers to your questions
How is this different from backend feature development?
This service examines where existing API authorization or abuse controls can be bypassed, prioritizes weaknesses and defines retest cases. Feature delivery and new API contracts belong in backend systems engineering.
Do you check both roles and object ownership?
For authorized test identities, the review can cover cross-tenant access, same-tenant peer access, downgraded roles, nested object IDs, batch operations and asynchronous jobs.
Can remediation be implemented instead of only reported?
Implementation can be scoped separately with server-side policy changes, deny-path integration tests and a controlled release and rollback plan.
Our Approach
How we work with your team
Discovery
We review your goals, existing environment and the systems or workflows involved.
Engagement planning
Testing requires written authorization, named targets, allowed techniques and stop conditions. We define the delivery plan and responsibilities together.
Results and handoff
Your team receives the agreed implementation or findings, testing results and a clear next-step plan.
Learn more about our process: Our Approach.
Related Services
Next step
Need to tighten backend enforcement?
Email info@demonicbinary.com with the system overview, key workflows, and which boundaries you are unsure about. We will propose a scoped hardening engagement.