The Attack Surface Finance and Legal Firms Can’t Afford to Ignore

For financial and legal organisations, information is the business.

Client records, financial information, contracts, intellectual property, transaction data, legal advice and confidential communications are all fundamental to the services these organisations provide. That also makes them valuable targets for cyber attackers.

But the challenge facing finance and legal firms isn’t simply the number of attacks they face. It is the increasing complexity of the environments they need to protect. Cloud applications, remote users, third-party suppliers, Microsoft 365, mobile devices, legacy infrastructure, client portals, SaaS platforms and AI tools are all becoming part of the modern working environment.

Every connection creates another potential route into the organisation.

And the biggest security risk may not be one obvious vulnerability. It could be the connection between several smaller weaknesses that, when combined, create an opportunity for an attacker.

Your attack surface is constantly changing

A modern finance or legal firm rarely has a simple IT environment. Employees may work from offices, from home or from client locations. Teams rely on cloud applications and SaaS platforms, while external suppliers and partners may require access to systems and data. New technology is continually introduced, while older infrastructure often remains operational because replacing it isn’t straightforward.

This means an organisation’s attack surface is constantly changing.

Security teams therefore need to understand more than which devices they own. They need to understand what connects to what, who can access it, what information is involved and what could happen if one part of the environment was compromised.

That visibility becomes particularly important in finance and legal environments, where a single compromised account or application could potentially provide access to highly confidential information.

One compromised account can be the beginning, not the end

Credentials remain an attractive target for attackers because identity can provide a route into multiple systems.

Imagine an employee account is compromised. The attacker may initially have limited access, but what happens next? Can they access Microsoft 365? Can they reach internal applications? Can they access client information? Can they discover privileged accounts? Can they move laterally across the network?

The initial compromise may appear relatively small. The potential consequences depend on what that identity can reach.

This makes identity, authentication and privileged access fundamental parts of modern cyber defence. Organisations need to regularly understand who has access to what and whether those permissions are still appropriate.

It isn’t enough to know that MFA is enabled. Security teams also need to understand what happens after an identity has been compromised and whether additional controls can prevent an attacker from turning one stolen account into a much larger incident.

The third-party problem

Finance and legal organisations rarely operate in isolation. They work with technology providers, cloud platforms, outsourced IT teams, professional advisers, contractors, software providers and clients.

These relationships can provide significant operational value, but they can also introduce additional access points into the environment.

The answer isn’t necessarily to remove third-party access. The important question is whether organisations understand what access exists, why it exists and whether it is still required.

A supplier account created for a specific project may remain active long after that project has ended. A privileged connection may no longer be necessary. An application may continue accessing information it no longer needs.

Individually, these might seem like relatively minor issues. Collectively, they can create unnecessary exposure.

For organisations managing highly confidential client information, third-party access therefore needs to form part of the wider security picture rather than being treated as a separate issue.

Confidential data changes the consequences

A cyber incident can be disruptive to any organisation. For finance and legal firms, the consequences can be particularly significant because of the nature of the information they hold.

Consider the potential exposure of client correspondence, contracts, financial information, M&A documentation, legal advice, intellectual property and personal data.

An attacker doesn’t necessarily need to disrupt an organisation’s operations to cause serious damage. Access to confidential information can itself have significant consequences.

This is why cybersecurity needs to consider data access as well as system access. Understanding where sensitive information sits, who can access it and how it could be reached following a compromise is becoming increasingly important.

Are your security tools actually working together?

Most established finance and legal organisations already have security technology in place. Firewalls, endpoint protection, email security, identity controls, vulnerability management, SIEM, MDR and cloud security can all form important parts of a defence strategy.

The challenge is that having these technologies doesn’t automatically mean an organisation has complete visibility.

An endpoint platform might identify suspicious activity. An identity platform could show an unusual login. A firewall might record unexpected network traffic, while a vulnerability scanner identifies a critical weakness.

Individually, these events may not appear connected.

An attacker, however, doesn’t necessarily operate within the boundaries of individual security products.

They look for opportunities to move from one system to another.

The question is whether your security team can see the same picture.

Vulnerability management needs context

A list of vulnerabilities doesn’t necessarily tell you which ones represent the greatest risk to the business.

A critical vulnerability on an isolated, low-value system may have a very different risk profile from a medium-severity weakness on an externally exposed system that connects to privileged infrastructure.

That is why vulnerability management needs to consider more than severity scores.

Organisations need to understand the context surrounding each weakness. What asset is affected? Is it externally exposed? Who can access it? What data does it hold? What systems does it connect to? Could exploiting it provide an attacker with their next step?

This is where understanding attack paths becomes increasingly important.

Rather than looking at vulnerabilities individually, security teams can start considering how several weaknesses, permissions and connections could potentially be combined.

What happens when prevention fails?

No security control is perfect.

A phishing email can bypass controls. A credential can be compromised. A vulnerability can be exploited. A trusted supplier can experience a breach. A user can make a mistake.

The question is what happens next.

Can your organisation detect unusual activity? Can you identify the affected account? Can you understand how an attacker is moving through the environment? Can you isolate a compromised endpoint? Can your security team investigate quickly? Can you contain the incident before it spreads?

For finance and legal organisations, detection and response are just as important as prevention.

This is where capabilities such as endpoint detection, network monitoring, threat hunting and managed detection and response can play an important role. The objective isn’t simply to generate more alerts. It is to identify meaningful activity and respond before an attacker can progress further.

Security needs to work around the business

The answer isn’t necessarily another security product.

Nor is it about creating increasingly restrictive controls that make it difficult for employees to do their jobs.

Finance and legal professionals need to collaborate, communicate and access information quickly. Security needs to support that reality.

The goal should be to understand how the organisation actually operates and then build appropriate security controls around it.

That means considering people, processes, identity, infrastructure, applications, data, third parties and security technology as connected parts of the same environment.

Taking this broader view can help organisations identify where genuine gaps exist rather than simply adding more layers of technology.

Finding the gaps before an attacker does

Finance and legal firms don’t need to eliminate every possible cyber risk. They need to understand where their most important exposure lies and focus their resources accordingly.

That means asking practical questions. Could a compromised employee account reach sensitive information? Could an attacker move laterally across the network? Are privileged accounts appropriately controlled? Do third parties have more access than they need? Are legacy systems creating unexpected connections? Can your security team see activity across the environment? Have you tested how your controls work together during a realistic attack scenario?

The answers can reveal more than another vulnerability report alone.

Because cybersecurity isn’t simply about protecting individual systems. It is about understanding how the whole environment behaves when something goes wrong.

For organisations handling sensitive financial and legal information, that understanding can be critical to containing an incident before a small compromise becomes a much larger problem.

At ANSecurity, we take a practical, vendor-agnostic approach to cybersecurity, helping organisations understand their environment, identify gaps and prioritise the areas that matter most.

You don’t need another supplier. You need people who understand your environment.