SaaS Penetration Testing
SaaS Penetration Testing: the evidence for your first big deal
Your first large enterprise customer arrives with a questionnaire, and one line on it asks for your security evidence. A SaaS penetration test delivers exactly that evidence: the demonstrated check that one tenant cannot see into another tenant's data, that roles hold, and that your core assumptions carry weight. At CyberSec42, every finding comes with an executed proof of concept, and the report is built so that a procurement team can work with it.
- Tailored to SaaS: multi-tenant isolation and access control sit at the center.
- Built for procurement: the report answers the questions on the security questionnaire.
- Every finding with a proof of concept, calibrated triage, no flood of false alarms.
- A review-ready artifact: executive summary, risk register, proof and fix per finding, plus a retest.
Why SaaS needs its own kind of test
A SaaS platform shares one infrastructure across many tenants. Everything then stands or falls on a single property: isolation. If one tenant can see into another tenant's data through a flaw, that is not one bug among many, it is a break in the core promise. A general scanner does not catch this class, because it lives in the permission design, not in a known code pattern. It only surfaces when someone deliberately tries to break out of their own tenant and backs the attempt with a proof of concept.
On top of that sits the commercial pressure: the first large customer is often the one who formally probes your security level first. Procurement does not want a marketing sentence, it wants demonstrated evidence. A SaaS penetration test is the way to have that evidence in hand before the question comes.
What we examine in SaaS
Tenant isolation
The core: can one tenant reach another tenant's data, objects or actions? We deliberately try to break out of a single tenant.
Access control and roles
Whether ownership checks take effect, whether roles and rights hold, and whether privileges can be escalated without authorization.
Authentication and sessions
Tokens, sessions, the password and reset flow, multi-factor, and how clean the transition between contexts is.
API and object access
Direct object references, mass assignment, and unchecked parameters that allow access beyond your own boundary.
Injection and server requests
SQL, command, template and SSRF, traced from the untrusted input all the way to the dangerous sink.
Secret and data handling
Where credentials and tenant keys live, whether they are logged or passed along, and how sensitive data is protected.
The scope is defined per project. What we test and what we explicitly do not test is put in writing before the test begins.
How the test runs
Scope and questionnaire alignment
We set the test scope and align it with the questions your enterprise procurement is likely to ask, so that the report answers the right ones in the end.
Multi-tenant setup
We test from the perspective of several tenants and roles, because isolation only shows itself when you try to reach from one account into another.
Testing and chaining
Every relevant class is examined, and individual weaknesses are connected into chains to gauge the actual impact across the tenant boundary.
Verification per finding
Only what can be backed by an executed proof of concept is carried as a finding. False alarms are discarded, not upgraded.
Report for procurement
You receive a review-ready report with an executive summary, a risk register, a proof and a suggested fix per finding, written so that it holds up to an enterprise procurement review.
Retest
After your fixes we re-examine the resolved findings and document the state, so that the remediation is evidenced.
Why CyberSec42
- Isolation as a core invariant. We test tenant separation against a defined invariant, not against a gut feeling about what looks suspicious.
- A proof per finding. Each reported finding comes with an executed proof of concept before it enters the report. No reporting on suspicion.
- Calibrated triage. Real over false positive, no severity inflation. A procurement team that has seen many reports notices the difference.
- Built for the sales process. The report is structured as an evidence artifact that answers the questions on the security questionnaire instead of raising new ones.
- Honest framing. A clean result means no finding on what we tested, never a blanket guarantee. That discipline is precisely what makes evidence credible.
Ready for your first big customer's security question?
In a free initial call we name the one property your platform depends on, usually tenant isolation, and outline what a test looks like that convinces procurement.
Book a free callCyberSec42 provides independent technical security testing. It is not an accredited certification body and does not provide legal advice.
Frequently asked questions
What is a SaaS penetration test?
A penetration test tailored to the particulars of a SaaS platform. At its center sit multi-tenant isolation and access control, that is, the question of whether a customer can reach only their own data and actions.
Why does my enterprise customer require security evidence?
Because they fold your platform into their own risk exposure. The procurement teams of large customers vet suppliers formally, often by questionnaire. A penetration test with demonstrated findings is the answer expected there.
What does a SaaS penetration test cost?
The effort depends on the scope: the number of tenant models, the roles, and the depth of the review. Rather than a flat rate, we first talk through your system and then give you an individual quote.
Do I get a report I can show my customer?
Yes. The report is built as a review-ready artifact, with an executive summary, a risk register and a proof per finding. It is written so that an enterprise procurement team can work with it.
What if findings are discovered?
Every finding comes with a suggested fix. After your corrections we re-examine the resolved areas in a retest and document the state, so that the remediation is evidenced.