The verdict in three sentences
A security audit for a B2B website costs 1,200 to 3,500 EUR in 2026, including HTTP header setup (CSP, HSTS), a WAF and a vulnerability scan. An annual penetration test adds 2,500 to 6,000 EUR depending on test depth. Against the average cost of a defacement or a data breach (tens of thousands of euros in remediation and reputational loss), this budget is simply operational insurance.
The cost of hardening in 2026
Securing a B2B site plays out across several layers: HTTP headers, application firewall, monitoring and offensive testing. Here are the 2026 market ranges.
| Service | Deliverable | 2026 cost (EUR) | Frequency |
|---|---|---|---|
| Security audit | Report + remediation plan | 1,200 - 3,500 | One-off |
| CSP/HSTS headers | Configuration + tests | 400 - 1,200 | Once |
| Managed WAF | Application firewall | 30 - 150/month | Monthly |
| Vulnerability scan | Automated report | 300 - 900 | Quarterly |
| Penetration test | Manual intrusion test | 2,500 - 6,000 | Annual |
| Monitoring / alerts | 24/7 surveillance | 50 - 250/month | Monthly |
Security headers (CSP, HSTS, X-Frame-Options, Referrer-Policy) are cheap to deploy but block a large share of common attacks such as clickjacking and script injection.
Financial risk and cyber insurance
A successful attack is not limited to technical remediation: it triggers business interruption, breach notification and reputational damage. Cyber insurance completes the setup.
| Item | 2026 range (EUR) | Note |
|---|---|---|
| Post-defacement remediation | 3,000 - 15,000 | Cleanup + hardening |
| Average SME breach cost | 20,000 - 80,000 | Technical + legal |
| Breach notification | 2,000 - 10,000 | Legal duty within 72 h |
| SME cyber insurance | 800 - 3,000/year | Annual premium |
| Business interruption | Variable | By downtime duration |
The full cost of a solid security posture (audit + headers + WAF + pentest + monitoring) stays under 10,000 EUR in year one, a fraction of the cost of a single major incident.
Mini case study
Wei, IT manager of a mid-sized industrial firm in Singapore, spots an intrusion attempt in his logs. He orders a 2,800 EUR security audit that reveals no CSP, no WAF and three critical vulnerabilities. Remediation (headers, managed WAF at 90 EUR/month, patches) is quoted at 1,400 EUR one-off, plus an annual pentest at 3,500 EUR and monitoring at 120 EUR/month. Year-one cost: 2,800 + 1,400 + 3,500 + 2,520 = 10,220 EUR. His cyber insurer cuts the premium by 15 % given the pentest. The investment pays for itself with the first blocked attack.
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FAQ
How much is a security audit for a B2B site in 2026?
Between 1,200 and 3,500 EUR depending on site and infrastructure complexity. A brochure site with forms and a client area sits at the high end.
Are security headers enough?
No, but they are the cheapest first line of defence (400 to 1,200 EUR). Combined with a WAF and monitoring, they block the majority of automated attacks.
How often should we run a penetration test?
At least once a year, or after any major change. Budget 2,500 to 6,000 EUR depending on the depth of the intrusion tests.
What does a security incident really cost?
A defacement costs 3,000 to 15,000 EUR to remediate, and an SME data breach 20,000 to 80,000 EUR between technical and legal work, not counting the mandatory breach notification within 72 hours.
Is cyber insurance worth it for an SME?
Yes. A premium of 800 to 3,000 EUR/year covers remediation, losses and legal fees. A recent pentest often lowers the premium by 10 to 20 %.
Let's scope your project. Describe your stack and entry points (forms, client area, API): we will quote a security audit and hardening, indicative budget 3,000 to 10,000 EUR in year one. 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.
