The verdict in three sentences
A web app security audit costs between 6 000 and 25 000 USD in 2026, depending on attack surface and depth. The core of the engagement is the OWASP Top 10 review, complemented by targeted penetration tests, code review and a prioritised report by criticality. For a CISO, this budget is marginal against the average cost of a compromise, which runs into tens of thousands.
Audit scopes and pricing
It all depends on what you put on the table: a simple API, a back office, or a multi-role platform. The wider the surface and the more roles, the higher the audit effort. 2026 orders of magnitude.
| Audit scope | Contents | Price 2026 (USD) |
|---|---|---|
| Express audit (API / simple app) | OWASP Top 10 + automated scan | 6 000 - 9 000 |
| Standard audit (business app) | OWASP + manual tests + report | 9 000 - 15 000 |
| Deep audit (multi-role) | + code review + business logic | 15 000 - 20 000 |
| Full audit (critical platform) | + infra + retest + support | 20 000 - 25 000 |
| Remediation retest | fix verification | 2 000 - 4 500 |
Vulnerability criticality
A good report doesn't just list flaws: it prioritises them by impact and exploitability, so your teams fix what matters first. Here is the typical reading grid of a 2026 report.
| Level | Example flaw | Recommended fix window |
|---|---|---|
| Critical | SQL injection, RCE | 24 - 72 h |
| High | Authentication bypass | 1 week |
| Medium | Stored XSS, IDOR | 2 - 4 weeks |
| Low | Minor information leak | quarter |
| Info | Missing headers | to plan |
Mini case study
Sophie, CISO of a SaaS scale-up in Lille, must audit an app before onboarding an enterprise client demanding security guarantees. She commissions a standard audit at 11 000 USD. The report reveals two critical flaws (an IDOR exposing customer data and an injection). Internal fix cost is 4 person-days, about 3 000 USD. Total: 14 000 USD to avoid a breach that would have sunk a 200 000 USD annual contract. The audit becomes a sales argument, not just an expense.
FAQ
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What's the difference between an audit and a penetration test?
The audit is broader: it combines code review, configuration analysis and testing. The pen test simulates a real attack on a defined scope. Both are complementary; audits often include a pen-test component.
Should we audit at every release?
Not systematically, but a full audit is recommended at launch then annually, with continuous automated scans in between. A major architecture change warrants a new audit.
Is the retest essential?
Yes, strongly. Without a retest you have no proof that fixes actually close the flaws. Budget 2 000 to 4 500 USD for this often-skipped step.
Does an audit guarantee no vulnerabilities?
No, nothing guarantees that. An audit strongly reduces the known risk surface at a point in time and provides a prioritised remediation path.
How long does an audit take?
From 3 days for an express audit to 3 weeks for a critical platform, report included. The prioritised debrief is delivered within 5 business days after testing ends.
Let's scope your project. Tell us about your app, the number of roles and your go-live deadline: we define an audit scope and an indicative budget. 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.
