The verdict in three sentences
A web app security audit for a B2B portal costs between 3,000 and 12,000 EUR in Berlin in 2026, depending on scope and pentest depth. The audit covers at least the OWASP Top 10 and produces a prioritised remediation plan. Against the cost of a breach (GDPR fine, regulator notification, lost contracts, reputation damage), prevention remains the most profitable investment.
What a security audit costs in 2026
The price depends on the audit type (automated, manual, black box or white box) and the exposed surface. Here are the 2026 ballpark figures for the Berlin market.
| Service | Scope | 2026 price (EUR) | Timeline |
|---|---|---|---|
| Automated scan + report | Brochure application | 1,500 - 3,000 | 1 week |
| Black-box pentest | Standard customer portal | 4,000 - 7,000 | 2 - 3 weeks |
| White-box pentest | Portal + API + authentication | 8,000 - 12,000 | 3 - 4 weeks |
| In-depth code audit | Critical business application | 10,000 - 18,000 | 4 - 6 weeks |
| Guided remediation | Fixing the flaws | 3,000 - 10,000 | 2 - 4 weeks |
An audit without remediation has little value: plan the fix budget from the start.
The OWASP Top 10 and common flaws
Most incidents come from a small number of flaw categories. Here are the most common on B2B portals and their 2026 criticality.
| OWASP flaw | Observed frequency | Criticality | Average remediation cost |
|---|---|---|---|
| Broken access control | Very high | Critical | 2,000 - 6,000 EUR |
| Injection (SQL, commands) | High | Critical | 1,500 - 5,000 EUR |
| Security misconfiguration | Very high | High | 1,000 - 3,000 EUR |
| Weak authentication | High | Critical | 2,000 - 5,000 EUR |
| Vulnerable components | Very high | High | 800 - 3,000 EUR |
| Sensitive data exposure | Medium | Critical | 2,500 - 7,000 EUR |
The cost of a breach approaches or exceeds 50,000 EUR once you add the GDPR fine (up to 4 % of global turnover), notifying data subjects, crisis management and lost customers.
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Mini case study
Sophie, CISO of a 120-person industrial SME in Berlin, runs a portal exposing orders and data for 2,300 business customers. She orders a white-box pentest at 9,500 EUR, which reveals a broken access control letting one customer see another's orders. Remediation costs 4,500 EUR, for 14,000 EUR total.
Against that, a leak of those 2,300 customers' data would have triggered a regulator notification, a fine estimated in the tens of thousands of euros, and the likely loss of two key accounts worth 180,000 EUR/year. The return on prevention is immediate: 14,000 EUR to avoid a six-figure risk.
FAQ
What's the difference between an automated scan and a pentest? An automated scan detects known flaws quickly and cheaply (1,500 to 3,000 EUR). A pentest adds human expertise to exploit chains of flaws no tool finds alone.
How often should a B2B app be audited? At least once a year, and systematically after a major change (new data-exposing feature, auth change). A monthly automated scan usefully complements the annual audit.
What does a GDPR breach really cost? Beyond the fine (up to 4 % of global turnover or 20M EUR), count notification, crisis management and lost trust. The total frequently exceeds 50,000 EUR for an SME.
Does the pentest disrupt production? No, a well-run pentest uses a pre-production environment or takes precautions on production. The 2 to 4 week timelines include those precautions.
What's in the audit report? A prioritised list of vulnerabilities by criticality, proof of exploitation, and a costed remediation plan. That plan drives the fix budget.
Let's scope your project. Tell us your portal type, the volume of sensitive data exposed and your compliance requirement, and we'll scope the right 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.
