Start with the right question.
Consider a growing SaaS application with multiple customer accounts, shared infrastructure, and an API used by both its web interface and integrations. New features are ready to ship, but the team needs to understand whether the boundaries between customers hold up.
The assessment focuses on how the application behaves when someone moves beyond its intended workflows. It examines authorization, authentication, session handling, and the business logic behind sensitive actions within an agreed scope.
From context to clarity.
Each engagement starts with an agreed scope. Here is how a review of this kind can take shape.
- 01
Define the boundaries
Agree on the applications, endpoints, test accounts, permitted techniques, and testing window. Establish a contact and an escalation path before testing begins.
- 02
Test the real workflows
Map the application and examine how different roles interact with protected resources. Combine targeted tooling with manual investigation of the application’s logic.
- 03
Validate and document
Confirm findings with the minimum evidence needed to demonstrate impact. Record the affected components, reproduction steps, and the conditions required.
- 04
Prioritize the next action
Explain the business impact, recommend a practical fix, and agree how remediation can be verified. Any retesting is defined in the engagement scope.
The detail behind the headline.
A useful report connects the observation to its impact, explains what to change, and makes the next step clear.
A missing account boundary
Authorization- What we observed
- In this example, a signed-in user changes a resource identifier and receives a record belonging to a different customer account. The endpoint checks that the user is authenticated, but does not verify ownership of the requested record.
- Why it matters
- Customer information could be exposed across account boundaries. The final severity depends on the sensitivity of the data, the access required, and the extent of the affected functionality.
- Recommended action
- Enforce authorization on the server for every protected resource. Derive the permitted account scope from the authenticated identity and apply it consistently to reads and updates.
- How to verify
- Repeat the original test with separate customer accounts, check adjacent endpoints, and confirm that legitimate same-account workflows still work.
A report with a way forward.
The exact deliverables are agreed during scoping. An assessment of this kind can include:
An executive view of risk
The assessed scope, key themes, and business implications, written for the people making decisions.
Evidence your team can use
Validated technical findings with affected components, reproduction steps, and appropriately redacted evidence.
A practical remediation plan
A clear explanation of what to change, which issues deserve attention first, and how fixes can be checked.