The Cost of a Cyberattack for an SME: Figures and Consequences

The financial and operational impact of a cyberattack on a small business.

Table of Contents:

Threats that specifically target SMEs
The 10 essential measures for an SME
The cybersecurity budget for an SME
AI in the service of SME cybersecurity
GDPR and legal obligations
Conclusion

Cybersecurity is no longer a luxury reserved for large corporations. In 2026, SMEs have become the prime target for cyberattacks — precisely because they are often the least protected. 43% of cyberattacks now target small businesses, and 60% of SMEs that fall victim to a serious attack shut down within 6 months.

Threats that specifically target SMEs

Ransomware

Ransomware remains the number one threat. Attackers encrypt your data and demand a ransom (typically between €10,000 and €500,000). SMEs are targeted because they pay up more often than large corporations, which have dedicated security teams.

Phishing and social engineering

90% of attacks start with a phishing email. Techniques are becoming increasingly sophisticated, with generative AI now capable of crafting messages that are nearly indistinguishable from legitimate ones.

Data theft

Your SME's customer, supplier, and financial data holds significant value on the dark web. A data breach triggers legal obligations (CNIL notification within 72 hours), GDPR fines, and a loss of trust.

Supply chain attacks

Attackers target your suppliers or service providers to gain access to your business. The security of your ecosystem is just as important as your own.

The 10 essential measures for an SME

Automated backups: follow the 3-2-1 rule (3 copies, 2 different media types, 1 offsite). Test restoration regularly.

Automatic updates: keep operating systems, software, and firmware always up to date. 85% of attacks exploit known vulnerabilities.

Multi-factor authentication (MFA): on all critical accounts (email, banking, cloud, CRM). MFA blocks 99% of password-based attacks.

Team training: awareness of phishing, password best practices, and incident reporting. Refresh every 6 months.

Antivirus and EDR: endpoint protection with advanced detection (EDR rather than traditional antivirus).

Firewall and network segmentation: isolate critical systems from the rest of the network.

Access management: apply the principle of least privilege (each user only accesses what they need).

Data encryption: disks, emails, and file transfers.

Business continuity plan: documented procedures in the event of an incident.

Cyber insurance: transfer residual risk to an insurer.

The cybersecurity budget for an SME

A good rule of thumb: invest 5 to 10% of your IT budget in cybersecurity.

For an SME with 10–50 employees:

Basic solutions (antivirus, firewall, MFA): €200–500/month
Cloud backups: €50–200/month
Annual training: €1,000–3,000
Security audit: €3,000–10,000 (one-time)
Cyber insurance: €1,000–5,000/year

Total: €6,000–15,000/year. That's a fraction of the cost of a cyberattack (average cost for an SME: €130,000).

AI in the service of SME cybersecurity

Artificial intelligence is strengthening security through:

Anomaly detection: AI identifies suspicious behavior in real time
Anti-phishing: AI-powered email analysis to detect phishing attempts
Automated response: automatic isolation of compromised machines
Vulnerability analysis: continuous scanning of your attack surface

GDPR and legal obligations

As a French SME, you are required to:

Appoint a GDPR lead (even on a part-time basis)
Maintain a data processing register
Notify the CNIL within 72 hours of a data breach
Obtain explicit consent for personal data
Honor data subject rights (access, correction, deletion)

GDPR fines can reach up to 4% of annual revenue or €20 million.

Going further: check out our Digital Transformation for SMEs: The Ultimate 2026 Guide, which covers the full picture.

Conclusion

Cybersecurity is an investment, not a cost. SMEs that secure their systems protect their business, their customers, and their reputation. The solutions are out there, they're financially accessible, and the return on investment is immediate — measured in risks avoided.

Secure your SME: request a security audit.