How to manage Cyber security for professional services teams

If you run a professional services firm — accountants, lawyers, consultants, architects — the question isn’t whether you’ll face an attack, it’s how costly the next one will be. Cyber security for professional services is about protecting client trust and your ability to deliver work on time, not impressing auditors with diagrams.

Use these four practical criteria to choose what to fix first and how to compare suppliers: each criterion is a test you can run in a morning, and each has a clear business outcome.

1. Map access and priorities: who really has keys to the kingdom?

Start by listing where client data lives and who can touch it. Don’t stop at “employees” — include service accounts, third‑party apps, contractors and those occasional admin overrides. The point is to understand which accounts would cause the most damage if compromised, and to make those accounts harder to use from a distance.

This is a quick, high‑value exercise: you’ll identify a handful of accounts whose compromise would stop billing, ruin a report, or expose sensitive client files. Fixing those first reduces exposure fast — often at low cost — because the controls are targeted rather than organisation‑wide theatre.

2. Enforce MFA for every user (and prove it’s enforced)

Multi‑factor authentication (MFA) is the single control that most quickly raises the bar for attackers. But the detail matters: is MFA actually enforced for every account, or is it quietly bypassed for convenience? When we audit MFA across new clients we onboard, fewer than 40% have it actually enforced for every user — most have a Conditional Access policy in place that quietly excludes service accounts, admins, or whichever person complained loudest. That’s the gap attackers look for.

For professional services firms, enforce MFA everywhere practical, and document exceptions: a short risks‑and‑mitigations note is better than a policy that exists only in theory. If a supplier tells you “we support MFA”, ask whether it’s enforced for admins and non‑interactive accounts as well as staff.

3. How quickly can you cut and recover access after an incident?

Speed matters. The faster you can revoke a credential or isolate a compromised endpoint, the less scope there is for lateral movement and data exfiltration. Test your ability to cut access by simulating one incident — a suspected compromised mailbox or a laptop lost on a train — and time how long it takes to revoke tokens, rotate passwords, and restore legitimate access.

Runbooks that are too long or approvals that require three signatures are a liability. Design playbooks that get you back to business within hours for moderate incidents, and within a day or two for more significant ones. That’s what keeps clients calm and reduces billable loss.

4. Can you prove controls at audit and make clients comfortable?

Clients care about outcomes: timely delivery, confidentiality, and predictable fees. For regulated clients, you’ll need evidence of controls. The criterion here is simple — can you produce a short package that proves your core controls without ripping apart your systems? Auditors want logs, MFA evidence, and a snapshot of access lists; clients often want a short security summary they can show to their own risk teams.

Prepare a standard folder you can hand over: documented policies, MFA enforcement screenshots, recent patching cadence, and a concise incident response timeline. Keeping this up to date prevents last‑minute scrambling and protects reputations.

Putting the criteria together when you compare options

When you compare internal approaches, software vendors or managed providers, score each option against the four criteria above. For each supplier ask: how do they map access? Can they enforce MFA for every single account? How fast do they revoke and restore access, and how do they evidence controls? A simple matrix will reveal trade‑offs quickly: one supplier might be cheapest but slow to revoke; another might enforce MFA well but charge for each admin change.

If you’re considering outsourcing, lean on providers that can demonstrate repeatable outcomes: the ability to enforce policies, to respond rapidly, and to hand you an evidence pack at audit time. If you’d like a place to start with that conversation, consider talking to a supplier who offers managed options and clear delivery SLAs — for example our managed cyber security services team can show you how this looks in practice managed cyber security services.

Budget your first round of work to remove obvious gaps (MFA enforcement, admin account review, a short response playbook) and to establish a quarterly test cadence. That will buy you time and credibility while you organise the deeper technical work.

Next step: book a morning to run the four tests above. Score your current state, pick the top two gaps, and either fix them in house over a fortnight or assign them to a trusted supplier with SLAs for response time. You’ll reduce immediate risk, protect client trust and free up space to plan longer‑term resilience.

For most UK professional services firms, the outcome you want is simple: fewer surprises, less downtime, and clients who feel secure. Start with the quick wins and measure the difference in time saved and reputational risk avoided — then iterate.