Cybersecurity Checklist for a 50-Person Company
A prioritized security checklist for a growing company with limited IT staff.
A 50-person company should implement security controls in risk-per-dollar order: enforce MFA and deploy a password manager first, secure email, roll out managed endpoint protection, patch on a defined schedule, maintain tested 3-2-1 backups, apply network basics, govern SaaS vendors, and document everything for cyber insurance. Each item below includes what to do, why it matters, and what "done" looks like.
This list assumes the reality of a growing company: one or two IT people, no dedicated security staff, a mix of cloud and on-premise systems, and a budget that has to be justified. It is deliberately prioritized — the items at the top stop the attacks that actually hit companies your size, and they cost the least. If you operate network infrastructure as a WISP, use the WISP-specific security checklist instead; it covers towers and customer data on top of these fundamentals.
The checklist at a glance
| Priority | Area | Key actions | Relative cost |
|---|---|---|---|
| 1 | Identity | MFA everywhere, password manager, kill shared accounts | Low |
| 2 | Filtering, anti-phishing, payment verification rules | Low | |
| 3 | Endpoint | EDR/AV on every device, managed monitoring | Moderate |
| 4 | Patching | Written policy, severity SLAs, compliance reporting | Low |
| 5 | Backups | 3-2-1 rule, isolated copies, tested restores | Moderate |
| 6 | Network | Firewall hygiene, guest Wi-Fi, VPN with MFA | Low |
| 7 | SaaS and vendors | Access reviews, offboarding, vendor inventory | Low |
| 8 | Governance | Insurance readiness, incident response plan, training | Low |
Priority 1: Identity — MFA and password management
What: Enforce multi-factor authentication on email, remote access, admin consoles, and every cloud application that supports it. Deploy a company password manager so unique, strong passwords stop depending on memory. Eliminate shared accounts and shared inboxes with shared passwords.
Why: Stolen and reused passwords are the most common way attackers get into companies this size — through phishing, credential stuffing, or a breached third-party site. MFA blocks the large majority of credential-based attacks, and a password manager removes the reuse that makes one breach cascade into five.
Done looks like: MFA enforced (not merely enabled) for 100% of users on email and VPN, a conditional-access or equivalent block on legacy authentication protocols, every employee using the password manager, and no account whose password is known by more than one person. If your team works from anywhere, pair this with the endpoint and network measures in how to secure remote employees.
Priority 2: Email security
What: Run email through a filtering layer that catches phishing, malicious attachments, and impersonation attempts before they reach inboxes. Configure SPF, DKIM, and DMARC so attackers can't trivially spoof your domain. Establish an out-of-band verification rule for payment and banking changes.
Why: Email is the front door for both ransomware and business email compromise, and BEC — a fraudulent wire or a changed bank account — is frequently the most financially damaging incident a small company suffers. Filtering reduces volume; the verification rule stops the attacks that filtering misses.
Done looks like: Filtering in front of every mailbox, DMARC at an enforcement policy for your domain, and a written rule — known by everyone in finance — that any change to payment instructions is confirmed by phone on a known number. No exceptions for urgency; urgency is the attack.
Priority 3: Endpoint protection
What: Deploy modern endpoint protection — EDR at minimum on servers and any device touching sensitive data — across every workstation, laptop, and server, including devices used by remote staff. Have someone actually watching the alerts, whether that's your IT person with a managed console or an MDR provider.
Why: Ransomware and malware ultimately execute on endpoints. Traditional antivirus catches known-bad files; EDR watches behavior and catches the hands-on-keyboard activity that precedes encryption. The detection gap between them is the difference between an alert on Tuesday and a ransom note on Saturday. The trade-offs are covered in depth in EDR vs MDR vs antivirus.
Done looks like: Every device enrolled and reporting — verified against your asset list, not assumed — tamper protection enabled so users and malware can't disable the agent, and alerts routed to someone who will respond within hours, around the clock.
Priority 4: Patching
What: Write down a patch policy with severity-based deadlines, automate deployment wherever tooling allows, and measure compliance monthly. Cover operating systems, browsers, third-party applications, and firmware on firewalls and network gear — not just Windows Update.
Why: Unpatched, internet-facing vulnerabilities are one of the most common ransomware entry points, and they are entirely fixable with process rather than money. Attackers scan for known flaws within days of disclosure; a monthly patch cycle that includes a critical VPN or firewall bug is an open door for most of the month.
Done looks like: A written policy with targets you actually meet — the patch management policy template gives you the seven sections to adapt — critical patches applied inside days rather than weeks, and a monthly report showing coverage. If you can't state your patch compliance percentage today, how to measure patch compliance shows you how to start.
Priority 5: Backups — 3-2-1 with tested restores
What: Follow the 3-2-1 rule: at least three copies of important data, on two different media or platforms, with one copy isolated — offline, air-gapped, or immutable with separate credentials. Test restores on a schedule, and document how long a full restore actually takes.
Why: Backups are the difference between a ransomware incident being a bad week and a business-ending event. Attackers specifically hunt and destroy reachable backups before encrypting production data, so the isolation property matters more than the backup product. A backup you've never restored is a hypothesis, not a control.
Done looks like: Automated backups completing successfully every day, at least one copy that ransomware cannot reach with domain credentials, and a quarterly test restore that someone times and signs off on. Understand which data lives where — endpoint backup versus server backup explains why laptops and file servers need different treatment.
Priority 6: Network basics
What: Keep the firewall firmware current, close inbound ports you don't need, put guest and IoT devices on a separate network, require the VPN (with MFA) for any remote administration, and change every default password on network equipment. Know what's on your network — an asset inventory is a security control, not paperwork.
Why: The firewall and VPN concentrator are internet-facing infrastructure — exactly the class of device attackers scan for known vulnerabilities. Flat networks let a single compromised device reach everything; even basic segmentation between guests, endpoints, and servers slows lateral movement dramatically.
Done looks like: An inbound firewall rule list you can explain line by line, no remote desktop exposed to the internet, Wi-Fi separated into staff and guest networks, and an asset inventory that matches what a network scan actually finds.
Priority 7: SaaS and vendor hygiene
What: Keep an inventory of the SaaS applications and vendors that hold your data or have access to your systems. Review user access quarterly, enforce offboarding that disables accounts the day someone leaves, and turn on MFA at the tenant level for every business application — not just email.
Why: At 50 people, your data lives in a dozen cloud services, and your attack surface includes every vendor with a login to your environment. Dormant accounts for departed employees are a common and embarrassing breach vector, and a compromised vendor can become your incident.
Done looks like: A one-page vendor and application inventory with an owner for each entry, an offboarding checklist that is actually executed — verifiable by pulling a leaver's account status the week they go — and quarterly access reviews that remove permissions people no longer need.
Priority 8: Governance — insurance readiness and response planning
What: Write a short incident response plan with a call tree, run an annual tabletop exercise, deliver basic security awareness training with phishing simulations, and collect the evidence your cyber insurer will ask for at renewal.
Why: Insurance questionnaires now function as de facto security audits: MFA, endpoint protection, backups, and response plans are standard questions, and an inaccurate attestation can jeopardize a claim. The response plan is what makes everything else pay off under pressure — our step-by-step guide to building an incident response plan includes the one-page version a company this size can maintain, and what happens during a ransomware attack shows the scenario to rehearse against.
Done looks like: A written plan with current after-hours contacts, one tabletop exercise completed in the last twelve months with action items closed, and a folder of evidence — MFA reports, patch compliance, backup test logs — ready for the renewal questionnaire. The questions you'll face map almost one-to-one onto this checklist; preparing for a cyber insurance questionnaire walks through them.
"Security for a 50-person company is not about buying more tools. It's about doing eight unglamorous things completely, in the right order, and being able to prove it."
Key takeaway: a completed checklist with evidence beats a half-deployed stack every time — especially at insurance renewal.
Making it stick
Assign each priority area a named owner — for a company this size, usually the IT lead owns technical areas and an operations or finance lead owns governance. Review the checklist quarterly: pull MFA coverage, patch compliance, backup test results, and the vendor inventory, and note anything that slipped. Trends matter more than any single number.
For a fast baseline you can repeat each quarter, our security score calculator turns the major control areas into a scored self-assessment. And if you want an outside view of where the real gaps are, the SmashByte Security team runs structured assessments built around exactly this prioritization.
Frequently asked questions
What is the single most important security control for a 50-person company?
Multi-factor authentication on email and remote access, because stolen passwords are the most common way attackers get in and MFA blocks the large majority of credential-based attacks. It is also cheap and fast to deploy compared to almost any other control. If you do only one thing from this checklist, make it MFA — then move immediately to backups and patching.
How much should a 50-person company spend on cybersecurity?
There is no reliable universal benchmark, and published percentages vary widely by industry and methodology. A more useful approach is to fund the checklist in priority order: identity and email controls cost little, endpoint protection and backups are moderate recurring costs, and the remaining budget goes to the gaps a security assessment actually finds in your environment.
Do we need a full-time security person at 50 employees?
Usually not. A 50-person company typically needs a named internal owner for security decisions — often the IT manager or operations lead — paired with external help for monitoring and specialist work: an MSP or MDR provider for 24/7 detection, and periodic assessments to check the program. The checklist works precisely because each item has an owner, not because you hired a security team.
How does this checklist relate to cyber insurance requirements?
It maps closely. Insurers routinely ask about MFA, endpoint protection, patching, backups, and incident response planning — which are exactly the priorities on this list. Completing the checklist gives you honest, defensible answers on the questionnaire and reduces the chance of a claim being disputed over a control you attested to but had not actually implemented.
Want this checklist mapped to your actual environment?
SmashByte Security assesses growing companies against these priorities, identifies the gaps that matter most, and builds a remediation plan sized for a small IT team.
Request Security Assessment
