The verdict in three sentences
A security audit + penetration test finds your vulnerabilities before an attacker does, with an OWASP report and a prioritized remediation plan. In 2026 in New York, budget 5,000 to 20,000 EUR for the audit depending on scope, plus 4,000 to 15,000 EUR of remediation. The average cost of a data breach for an SME exceeds 100,000 EUR: the annual pentest is now expected by large accounts and cyber insurers.
Audit and pentest cost in 2026
Price depends on scope (application, API, infrastructure), depth (black, grey or white box) and requirement level (certification, compliance).
| Service | Scope | Timeline | Cost 2026 (EUR) |
|---|---|---|---|
| Express audit | 1 brochure app | 3-5 days | 5,000 - 8,000 |
| App pentest | app + auth | 5-10 days | 8,000 - 14,000 |
| Full audit | app + API + infra | 10-15 days | 14,000 - 20,000 |
| Remediation | fixing the flaws | 1-4 wks | 4,000 - 15,000 |
| Validation retest | verify the fixes | 1-3 days | 2,000 - 4,000 |
| Annual pentest (contract) | recurring follow-up | yearly | 6,000 - 12,000/yr |
The costliest flaws in 2026
The OWASP Top 10 remains the reference. Here are the categories most often critical in our B2B application audits, with typical fix effort.
| OWASP flaw | Frequency | Severity | Fix effort |
|---|---|---|---|
| Broken access control | very common | critical | 3-8 days |
| Injection (SQL, NoSQL) | common | critical | 2-5 days |
| Security misconfiguration | very common | high | 1-3 days |
| Weak authentication | common | high | 2-6 days |
| Outdated components | very common | medium to high | 1-4 days |
| Data exposure | common | high | 2-5 days |
Mini case study
Mr Reynaud, IT director of a 30-person SaaS SME in New York, must pass a certification required by a Fortune 500 client. He orders an app pentest at 12,000 EUR (10 days) that reveals a broken access control letting one user read another client's data. Remediation costs 7,000 EUR and a retest 3,000 EUR. Total: 22,000 EUR. The contract won thanks to the certification is worth 180,000 EUR/year: the security investment is 12% of the first year and unlocks a multi-year relationship.
FAQ
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Black, grey or white box: which to choose?
Grey box (access with test accounts) offers the best cost/coverage ratio for a B2B app. White box (with source code) is more exhaustive and recommended before a certification.
How often should a pentest be redone?
At least once a year, and after any major change (new sensitive feature, migration). Cyber insurers and many tenders now require it.
Does an audit guarantee no flaws?
No: it strongly reduces risk on the tested scope at a given moment. Security is a continuous process, not a permanent certificate. The retest confirms the fixes hold.
Can a pentest break my app in production?
A serious provider preferably tests on a staging environment or with strict precautions in production. Scope and intervention windows are contracted in advance.
What's in the deliverable?
A report with flaws ranked by severity (CVSS), exploitation evidence, and a prioritized remediation plan with effort estimates. This document is what reassures clients and insurers.
Let's scope your project. Tell us the scope (application, API, infra), the goal (certification, insurance, tender) and your budget, and we will frame the audit and remediation. 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.
