Web application security audit cost and scope in 2026

The verdict in three sentences

A serious security audit on a web application costs between 4,500 and 12,000 EUR for an application pentest, plus 3,000 to 8,000 EUR for a code audit. Remediation represents 20 to 40% of the audit cost. Compared to the average cost of a cyber incident for an SME, often above 50,000 EUR, the audit pays for itself with the first major avoided risk.

The cost: pentest, code audit and remediation

An audit consists of three distinct building blocks to price separately. The application pentest simulates real attacker behavior. The code audit inspects the source for structural flaws. Remediation fixes what was found, then a re-test validates the corrections.

Scope is the first cost lever: auditing a contact form has nothing to do with auditing a transactional application with a client area, payment and API. Define it precisely before requesting a quote.

Deliverables, frequency and compliance

A good audit is not just a list of flaws: it delivers a prioritized, actionable remediation plan. Here is what you should receive and how often to repeat the exercise.

Beyond technical risk, the audit serves two governance goals: demonstrating your GDPR diligence in case of a regulator inspection, and satisfying the growing demands of cyber insurers who tie coverage to a proven security level.

Mini case study

Nadia is CISO of an e-commerce SME in Bordeaux about to launch a client area with payment. Before go-live, she orders a broad application pentest at 9,500 EUR and a code audit at 5,000 EUR, meaning 14,500 EUR. The audit reveals an injection flaw allowing access to other customers' orders. Remediation costs 4,000 EUR and the re-test 2,000 EUR. Total: 20,500 EUR. An equivalent incident, with customer data breach, would have cost between 50,000 and 150,000 EUR (regulator notification, lost trust, legal fees). The risk math justifies the audit on its own.

FAQ

What is the difference between a pentest and a code audit?

The pentest attacks the application from the outside like a hacker would, without necessarily seeing the code. The code audit inspects the source for structural flaws invisible from outside. Both are complementary; a full audit combines them.

How often should we audit an application?

A sensitive application (payment, personal data) deserves a full annual audit, plus a targeted audit after each major change. A low-risk internal application can settle for an audit every two years.

How much does remediation cost?

Expect 20 to 40% of the audit cost, depending on the number and severity of flaws. A well-designed application has fewer flaws to fix; that is why secure development upfront costs less than remediation.

Is an audit useful for cyber insurance?

Yes, increasingly. Insurers tie coverage and premium levels to a proven security posture. A recent audit report and an applied remediation plan clearly strengthen your case.

Does an audit guarantee total security?

No, no audit guarantees zero risk. It strongly reduces the known attack surface at a point in time. That is why frequency and re-testing matter: security is a continuous process, not a permanent certificate.

Let's scope your project. Tell us your application's scope (client area, payment, API) and your go-live deadline: we scope pentest, code audit and remediation. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.