This engagement puts that isolation, and the rest of your application, under a rigorous manual test, and delivers a report that shortens enterprise reviews and satisfies your SOC 2 or ISO auditors.
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For a SaaS product, security is a feature you sell. Every enterprise prospect runs a security review, every compliance path asks for a test, and the single question that matters most is one scanners cannot answer: can one customer reach another customer's data? Multi-tenant isolation is the make-or-break property of your platform.
This engagement puts that isolation, and the rest of your application, under a rigorous manual test, and delivers a report that shortens enterprise reviews and satisfies your SOC 2 or ISO auditors.
A SaaS platform serves many customers from shared infrastructure, and the boundary between them lives entirely in your application logic. A single missing authorization check can let a user in one tenant read, or worse modify, data belonging to another. Proving that boundary holds requires a tester working authenticated as multiple accounts, attempting to cross it deliberately, which no automated tool does meaningfully.
SaaS growth runs through enterprise deals, and enterprise deals run through security reviews. A recent, professional penetration test report is often the fastest way past a prospect's vendor-risk questionnaire, turning what could be weeks of back-and-forth into a single attachment that answers their concerns.
The same test feeds your compliance goals. Whether you are pursuing SOC 2, ISO 27001, or simply answering customer due diligence, the multi-tenant and API testing here produces the evidence those processes demand, so one engagement serves both sales and audit.
The core test: authenticated as multiple tenants, we attempt to read and modify each other's data across every object type, hunting the missing checks that break isolation.
Vertical privilege escalation within a tenant, ensuring a member cannot perform admin or owner actions, and that invitation and role-change flows cannot be abused.
Direct testing of your API for broken object-level and function-level authorization, mass assignment, and excessive data exposure, aligned to the OWASP API Security Top 10.
Login, SSO, session handling, and the OWASP web fundamentals: injection, cross-site scripting, and insecure configuration.
The report serves both your sales and audit needs. It contains:
An endpoint that returns or edits another tenant's records when an id is changed, the defining SaaS vulnerability and an instant deal-breaker for enterprise buyers.
A normal member reaching admin functions because authorization is enforced only in the UI, not on the server.
An API that lets a client set fields it should not, such as a role or tenant id, by adding them to the request body.
Endpoints returning internal fields or other users' data that the interface never displays but the API quietly includes.
Tenant isolation: whether one customer can reach another customer's data. We test it by working authenticated as multiple tenants and deliberately trying to cross the boundary, which is the flaw enterprise buyers and auditors care about most.
Yes. Enterprise buyers run security reviews, and a recent independent penetration test report frequently answers the bulk of their vendor questionnaire, turning weeks of back-and-forth into a single document.
Yes. The multi-tenant and API testing here produces the evidence both your enterprise prospects and your SOC 2 or ISO auditors need, so a single engagement serves both.
Typically one to two weeks depending on the number of roles and the size of the API, followed by the report. We confirm scope and timing in a short call first.
Book a free 30-minute scoping call. We agree the scope, timeline, and a fixed price up front — no obligation, and no surprises for your deadline.