10 Security Gaps We See in Small Businesses And How to Fix Them

If you run a small business, chances are nobody has ever walked you through your actual security gaps, and that's exactly what makes small businesses such an easy target. You've probably told yourself hackers go after big companies with big money, not a 12-person accounting firm or a regional e-commerce shop.

According to Verizon's 2025 Data Breach Investigations Report, ransomware was present in 88% of confirmed breaches at small and mid-sized businesses last year, compared with 39% at larger organizations, and ransomware activity overall rose 37% year over year. In the UK, the government's official Cyber Security Breaches Survey, run by the Department for Science, Innovation and Technology, found that 43% of businesses identified a breach or cyber attack in the past 12 months, roughly 612,000 companies, with phishing behind the large majority of incidents.

So, what are the most common cybersecurity mistakes small businesses make? Before we get into specifics, it helps to define terms. The security gaps meaning we're using here is simple: any point where a system, a process, or a habit leaves your business open to an attacker that a small fix could have closed.

At Ispirer, security wasn't originally our starting point. We started by building our own tools, including database and data migration software, along with automated code conversion. From there, that grew into full database migration services and application conversion services. 

Building tools that move and transform database structures, data, and code means we spend a lot of time working directly with authentication, access controls, and system configuration during migrations and software development, which is exactly where most of the gaps below tend to live. That overlap is why we also run security diagnostics and hardening engagements alongside our migration work. Between the migrations and those engagements, we keep running into the same common small business security mistakes, regardless of industry.

Here are the ten common IT security gaps we see most often, and what to do about each one.

1. No multi-factor authentication (or only partial coverage)

A password alone is not a lock anymore, it's a suggestion. Multi-factor authentication (MFA) blocks the overwhelming majority of automated account bruteforce attempts, yet fewer than a third of small businesses have it turned on across their accounts. Usually it's not that no one thought of it, it's that MFA got enabled on email and stopped there, leaving admin panels, banking portals, and cloud consoles wide open. Credential stuffing, where passwords leaked from an unrelated breach get tried automatically against your accounts, is especially common against small businesses simply because password reuse is so common.

Fix: “Turn on MFA everywhere an account can be reached from outside your building: email, VPN, cloud admin consoles, accounting software, remote access tools.”

2. Software that hasn't been patched in a while

This is one of the most basic IT security gaps out there, and one of the cheapest to close. Every piece of software gets security updates because someone found vulnerability and fixed it. If you're not installing those updates, the flaw is still there, and it's now public knowledge, which makes it far easier for an attacker to exploit than it would be to invent something new. Unpatched, internet-facing systems and exploited vulnerabilities are consistently among the top root causes behind security incidents. In a lot of cases, the flaw being exploited was publicly disclosed, and already fixed by the vendor, more than a year before anyone actually used it against the business.

Fix: “Set updates to install automatically wherever possible, and remediate security gaps like this before attackers find them, not after.”

3. Backups that look fine until you need them

This is one of the most unseen security gaps out there, because businesses usually don't find out their backups are broken until the day they need to restore from one. The most common failure pattern: backups sitting on the same network the attacker just compromised, backup software that was configured once and never checked again, or restore points that turn out to be corrupted or years out of date. A reasonable baseline is the 3-2-1 approach: three copies of your data, on two different types of storage, with at least one copy kept offline or otherwise out of reach of anything that could compromise your main network.

The gap between confidence and reality here is significant. One industry study found that 69% of businesses believed they were well prepared to respond to a ransomware attack, but only 22% actually recovered within 24 hours when a real incident hit. A backup you haven't tested isn't a backup. It's a guess.

Fix: “Keep at least one backup copy isolated from your main network, and actually run a test restore a couple of times a year.”

4. No incident response plan (or one nobody remembers exists)

Roughly three out of four small and mid-sized businesses have no formal plan for what to do when something goes wrong. In the businesses that do have one, it's often a document written two years ago, referencing systems that were retired since, with contact numbers for people who've left the company. This is exactly why a cyber security gap analysis for business often starts with backups and incident response: the two things nobody checks until it's too late. A workable plan doesn't need to be elaborate. It just needs to cover who has authority to take a system offline, how you'll communicate with staff and customers if data was exposed, and which vendor you'll call first.

Fix: “You don't need a 40-page plan. A single page with the five most important phone numbers, and a clear answer to who decides what, gets you most of the value.”

5. Employees who haven't been trained on modern phishing

Phishing used to be easy to spot: bad grammar, obviously fake sender addresses, a stranger needing help with a wire transfer. That version of phishing is mostly gone. AI has opened new AI security gaps, since phishing emails are now personalized and well written enough to fool trained employees, with open rates in the range of 54 to 78%, compared to around 12% for traditional phishing (source). The most expensive version of this is business email compromise, where an attacker impersonates an executive or a vendor closely enough to redirect a real payment, sometimes for tens of thousands of dollars from a single email.

Fix: “Short, recurring training beats an annual hour-long seminar nobody remembers. A quarterly reminder and an occasional simulated phishing test do more than one big session ever will.”

6. Cloud and email settings that were never locked down

If your business runs on Microsoft 365, Google Workspace, or AWS, and most do now, the security of that environment depends almost entirely on how it's configured, not on the platform itself. Cloud and email settings aren't unique problems: they're some of the common security gaps in business critical applications like your accounting platform, CRM, or point-of-sale system. Misconfigured email authentication alone affects a large majority of businesses assessed, with one recent benchmark putting the figure at 78%. Specific culprits we see often: missing or misconfigured SPF, DKIM, and DMARC records, admin accounts without extra protections, and access rules that were set up once and never revisited as the team grew.

Fix: “A cloud configuration review is a project that should be conducted regularly. It usually surfaces a handful of settings that take minutes to fix once someone points them out.”

7. Remote access left open to the whole internet

Remote desktop connections and VPN appliances are convenient, and they're also one of the first things an attacker scans for. A surprisingly common finding is a remote access port that's open to the public internet and that nobody in the company realized was exposed. This is one of the cyber security gaps that shows up in nearly every external assessment we run, and attackers don't need to target you specifically to find it. Automated scanning tools sweep the entire internet for open ports and outdated firmware around the clock, so exposure alone is often enough to draw attention.

Fix: “Remote access should go through a VPN with MFA enabled, not a direct connection exposed to the open internet.”

8. Everyone has more access than they need

In a small company, it's tempting to just give people broad access. It's faster, and nobody wants to be the bottleneck. But over-permissioned accounts and unnecessary connections between systems are exactly what let one compromised login turn into a company-wide problem. Former employees, old contractors, and long-dormant service accounts are common blind spots here, since checking whether they're still active usually isn't specifically anyone's job.

Fix: “If you're wondering how to remediate identity security gaps efficiently, start here: review who has admin rights, ask whether they still need it, and remove access immediately when someone leaves the company.”

9. One flat network for everything

Many small businesses run their point-of-sale system, guest Wi-Fi, office printers, and financial software all on the same network, with nothing separating them. That means if any single device gets compromised, even something as low-stakes as a smart thermostat or a guest laptop, an attacker can potentially reach your most sensitive systems from there. This is one of the more common business IT security mistakes to avoid for startups in particular, where infrastructure decisions get made quickly early on and rarely get revisited as the company grows.

Fix: “Basic network segmentation, separating guest Wi-Fi, general office devices, and sensitive systems like finance or customer data, is one of the cheaper security investments available relative to what it prevents.”

10. Security treated as a one-time purchase

Treating security as a one-time purchase is one of the common cybersecurity mistakes small businesses make, because threats change constantly while the initial setup doesn't. Staff turn over, software drifts out of date, and new SaaS tools and cloud services tend to get added faster than anyone updates the security setup to match, quietly widening the attack surface over time. Prevention is also simply cheaper than cleanup: typical annual prevention costs run around $5,000 to $15,000, while recovering from an actual incident commonly runs into six figures. Buying security once is not the same as having it.

Fix: “Treat security like accounting or payroll: something with a recurring rhythm, not a project with an end date.”

Final thoughts

None of these ten gaps are hard to understand once they're written out, which is exactly the problem. They're not complicated, they're just easy to overlook when you're busy running a business, and closing them doesn't usually require a massive budget or a full-time security hire.

The harder part is usually not the fixing, it's the finding. Most small businesses don't have a clear picture of where they actually stand until someone outside the day-to-day operation looks for it specifically, which is exactly the gap between feeling secure and actually being secure.