Cyber Security for UK Law Firms: Protecting Client Data, Email and Case Files.

Why cyber security matters for UK law firms.

Law firms are attractive targets because they hold confidential client information, identity documents, transaction details, contracts and payment instructions. A single compromised mailbox can expose sensitive matters or enable payment diversion fraud.

A well-designed cyber security approach helps protect client data, email and case files, reduces the risk of disruption and supports your firm’s ability to maintain client trust.

Secure email and access to prevent common attacks.

Email is a primary attack route for law firms. Threat actors often use convincing messages to request urgent payments, share malicious links or gain access to client information.

• Use multi-factor authentication (MFA) for all users.
• Apply conditional access and strong admin controls.
• Monitor mailbox rules and unusual forwarding activity.
• Carry out regular access reviews.
• Train staff to verify bank detail changes and urgent payment requests using a trusted channel outside email.

Control access to client data and case files.

Law firms store sensitive information across SharePoint, OneDrive, file servers and case management systems. Overly broad access increases risk and can lead to accidental or malicious data loss.

• Review permissions and apply matter-specific access where possible.
• Monitor external sharing and use expiry where appropriate.
• Remove access for former staff, consultants and suppliers promptly.
• Protect sensitive documents with appropriate controls.

Be ready to respond when it matters most.

Even with strong defences, incidents can happen. Law firms need an incident response plan that covers confidentiality, client communication, evidence preservation, insurer notification and restoration of critical services.

• Plan for different scenarios, including website compromise, email compromise and ransomware.
• Define roles and responsibilities.
• Prepare clear communication templates for clients and stakeholders.
• Test and update your plan regularly.