The verdict in three sentences
In 2026, a security audit is no longer a technical cost, it's a commercial prerequisite: without an attestation, the enterprise door stays shut. The most critical item for a multi-tenant SaaS isn't the classic vulnerability, it's tenant isolation: one client must never see another's data. A well-run pentest (15,000 to 50,000 USD) pays for itself on the first tender won thanks to the attestation.
How much a SaaS security audit costs
The price depends on scope: a simple application or a multi-tenant platform with a public API. Here are the 2026 ranges on the enterprise market.
| Audit type | Scope | 2026 price | Timeline |
|---|---|---|---|
| Web app pentest | Front + back, 1 role | 15,000-25,000 USD | 1-2 weeks |
| Multi-tenant pentest | Tenant isolation | 25,000-40,000 USD | 2-3 weeks |
| API audit (OWASP API Top 10) | Endpoints + auth | 12,000-30,000 USD | 1-2 weeks |
| Infra + cloud config audit | Network, IAM, secrets | 15,000-35,000 USD | 1-2 weeks |
| Full audit + re-test | Everything + fix verification | 40,000-50,000 USD | 4-5 weeks |
| Tender attestation | Signed report | included | +2-3 days |
The re-test is essential: a report listing flaws without verifying fixes reassures no buyer. Always demand a verification phase after remediation.
The scope and deliverables to demand
A B2B buyer won't settle for "all good". Here are the deliverables that make the difference in a bid file.
| Deliverable | Expected content | Value to the buyer |
|---|---|---|
| Executive report | Risk summary, overall score | leadership decision |
| Technical report | Flaws, CVSS, evidence | security team |
| Multi-tenant isolation test | Cross-account scenarios | core SaaS guarantee |
| OWASP Top 10 + API review | Category coverage | recognised standard |
| Remediation plan | Priorities, timelines | steering |
| Re-test attestation | Verified fixed flaws | contractual proof |
The re-test attestation is the document the client's procurement and IT teams want to see: it proves not only that flaws were found, but that they were fixed and verified.
Mini case study
Sarah is CTO of a logistics-management SaaS vendor, 9 people. A port operator (enterprise account) makes a 320,000 USD/year contract conditional on a full pentest with attestation. Sarah orders a multi-tenant + API audit at 38,000 USD, 3-week timeline. The audit reveals an isolation flaw (a poorly scoped token let one tenant read another's orders) and 4 medium OWASP flaws. Fixes in 6 days, re-test passed, attestation signed. Total cost: about 44,000 USD, i.e. 14 % of one year's contract, but the attestation becomes reusable for 3 other live tenders. Immediate ROI on signing the port contract.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Why is multi-tenant isolation so critical?
Because a single isolation flaw potentially exposes all your clients' data at once. It's the number-one SaaS risk and the first thing a serious auditor tests; a cross-tenant leak can sink the company.
How long does a full audit take?
Budget 2 to 5 weeks depending on scope: reconnaissance, testing, report writing, then remediation and re-test. The re-test adds 2-3 days but underpins the attestation's value.
Is an automated scan enough?
No. Automated tools catch known flaws but miss business-logic and multi-tenant isolation flaws that require manual testing. A demanding buyer wants a manual pentest, not a mere scan.
How often should you re-audit?
At least once a year, and after any major architecture change. Many enterprise accounts require an audit less than 12 months old in their vendor file.
Does the attestation carry weight in a tender?
Yes, it's often a mandatory bid document. A recent pentest attestation and a clear remediation plan can make the difference against a competitor who has none.
Let's scope your project. Specify your architecture (multi-tenant, public API), the number of roles and the tender deadline, and we'll frame the scope and audit price. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
