Publish Date
21/05/2026
Categories
Blogs Hot Topic
Legal firms have always been trusted with sensitive information, and unfortunately, that trust is exactly what makes them a target for cyber criminals.
It’s not just about legal systems or processes anymore. Cyber risk in the legal industry is directly tied to:
- Client confidentiality
- Client money
- Regulatory obligations
- And the ability to continue operating
That’s why attacks aren’t just increasing, but becoming more targeted, timed, and harder to detect – and with the introduction and use of AI, this gives criminals an even bigger advantage.
Why is the legal industry at risk?
The truth is, it’s always been at risk. It’s just that year on year, there are new attacks, new patterns – new ways of accessing systems. And law firms have everything cyber criminals want: highly sensitive information, a dependency on IT and a large reputation at stake (reputation = big news headlines).
The examples below show some of the most common risks for law firms today:
1. Identity is now the primary target
Attackers are focusing on user accounts, credentials, and session access rather than breaking into systems directly.
2. Email is still the main entry point (but the impact is higher)
Email compromise remains the most common way in, but in legal, the consequences are amplified by payment transactions and sensitive client data. Email-based attacks are becoming more convincing, with AI used to craft realistic messages that reflect legal language, colleague language/tone, and transaction context.
3. Time pressure is being exploited
Legal work is deadline-driven and document-heavy, creating ideal conditions for attackers to slip into workflows and stay unnoticed.
1) Business Email Compromise (BEC) & payment diversion
Criminals attack in the moment that feels most vulnerable usually through communication channels. This can lead to one of the most common attacks in the legal industry – Business Email Compromise (BEC).
BEC is a type of cyber attack where criminals impersonate a trusted contact (a colleague, client, supplier) to trick someone into transferring money or sharing sensitive information.
In simple terms, it’s fraud carried out through email (or similar communication), designed to look completely legitimate so it slips through normal checks.
Attackers often:
- Impersonate clients, partners, or third parties
- Time emails around completions or settlements
- Request changes to banking details or urgent transfers
Why it works in legal firms:
- Communication is largely email-based
- Transactions rely on trusted instructions
- Workflows prioritise speed and responsiveness
And crucially, these requests often appear completely legitimate because they fit the context so well. It’s easy to assume you’d spot something unusual – that something would feel “off” – but in reality, when you’re busy and focused on getting work done, it’s far easier than expected to take things at face value and fall into the trap.
What a BEC attack can look like in real life:
- A client emails to “update” bank details before completion
- A colleague requests urgent payment approval
- A third party shares revised transaction details
The real risk
This is one of the highest-impact threats to law firms because:
- It directly affects client money
- It often bypasses technical controls
- And it relies on process weaknesses, not system vulnerabilities
Payment diversion isn’t prevented by tools alone, because you must have repeatable and protected processes in place alongside this.
2) Account takeover & email monitoring
Attackers can use the above method, or phishing to gain credentials or access to a single account, but once they do, they don’t always act immediately. Instead, they:
- Monitor emails and client activity
- Learn workflows and communication patterns
- Wait for the right moment (e.g. a vulnerability)
Because legal firms rely on email for communication between clients, cloud platforms to share documents and have identity based access to certain systems, one compromised account can provide a ton of information for a criminal:
- Emails and documents
- Client data
- Financial conversations
What it can look like in real life:
- An account is accessed from an unusual location (by BEC, phishing)
- The attacker sets up email inbox rules to hide activity
- Sensitive emails are quietly forwarded externally
And over time, these attackers build a picture of payment timelines, who the key stakeholders are and where vulnerabilities lie (e.g. a lack of a process when payment details are changed).
The real risk
Quite often an attacker will remain undetected, creating greater impact:
- Sensitive data can be exposed
- Transactions can be manipulated
- Clients can be impersonated
And often, firms only discover the issue after something goes wrong (for example, there client database is suddenly empty).
💡 Reality check:
If a user account was compromised today, how quickly would you know? Would you know where to look?
3) Ransomware & data theft: the confidentiality threat
Ransomware in legal has evolved beyond simply locking down systems. Criminals now steal sensitive client data first to then encrypt systems and there can be threats to publish information if a payment (otherwise known as ransom) isn’t made within a certain timeframe.
Why legal firms are prime targets
It’s probably of no surprise to you to hear that legal teams hold everything attackers want:
- Client identities and personal data
- Financial and banking information
- Commercially sensitive documents
- Confidential communications
This makes them highly attractive to attackers looking to not only sell data and extort firms, but also like we’ve mentioned, damage reputation.
What it can looks like in real life:
- Access is gained through phishing or compromised credentials
- Data is quietly extracted
- Systems are locked (or threats are given with a ransom to pay)
At that point, the situation becomes a security incident, with a reputational crisis on the cards. And even if a firm did think about paying a ransom, there’s no guarantee that you’ll get your data back.
The real risk:
In legal, ransomware isn’t just about downtime – it also brings the risk of lost client trust, GDPR breach notifications, and long-term reputational damage that can be difficult to recover from.
What this means for law firms
Across all three threats, the pattern is clear:
- Attacks target identity, email, and workflows
- They exploit trust and timing, not just systems
- And they often go unnoticed because they look like normal activity
And with legal firms being part of a wider ecosystem, supplier or client weaknesses can also become your risk.
What “good” cyber security looks like for legal firms in 2026
1. Strengthen identity and access
- Phishing-resistant authentication where possible
- Role-based access controls
- Reduced reliance on passwords
2. Build process into high-risk workflows
- Treat all bank detail changes as suspicious
- Verify requests outside of email
- Use dual approval for payments
3. Improve detection and response
- Monitor unusual login behaviour
- Alert on mailbox rule changes
- Detect abnormal data access or downloads
- Look to outsource 24/7 monitoring or a SOC service
4. Focus on data protection by design
- Control how sensitive information is shared
- Reduce accidental data exposure
- Create clear audit trails
Ideally your firm should have:
✅ strong authentication in place (ideally phishing‑resistant)
✅ clear client money controls (Business Email Compromise accounted for)
✅ evidence-backed baseline security measures
✅ a tested incident response plan (not just backups)
✅ continuous monitoring of identity activity
Use this tomorrow:
Ask yourself:
- Would we spot a compromised email account quickly?
- Do we verify payment requests outside of email every time?
- Do we have visibility over how client data is accessed and shared?
If the answer to any of these is “not sure”, it’s best to have a look into your processes. We’ve also left our Cyber Security Guide for the Legal Industry here, and if you wish to speak to any of our team about the solutions we offer to law firms, they’d be more than happy to schedule in a call.