By Joe Seanor, CISSP | Cyber Investigator & Network Security Expert
In my years working as a cyber investigator, I’ve seen massive corporations breached—and I’ve seen 5-person startups taken down by one bad click.
The truth? Cybercriminals love small businesses.
Why? Because you’re likely underprotected, underfunded, and overconfident.
Even in 2025, small and mid-sized businesses (SMBs) are still making avoidable mistakes that cost them thousands—or even force them to shut their doors for good.
Here are the top 10 cybersecurity mistakes SMBs continue to make (and how you can fix them starting today).
1. Still Using “Admin123” as a Password
Yes, it’s still happening. Weak or reused passwords are one of the top causes of breaches—even in 2025.
Fix it:
- Use a password manager (like Bitwarden or 1Password)
- Enforce strong passwords and rotation policies
- Enable multi-factor authentication (MFA) everywhere
2. Not Backing Up—Or Not Testing Backups
Backing up your data is great. But if you’re not testing your backups, you may find out too late that they’re useless.
Fix it:
- Automate backups (daily if possible)
- Store at least one backup offsite and encrypted
- Run recovery drills quarterly
3. Thinking “We’re Too Small to Be a Target”
Attackers don’t care about your size—they care about your vulnerability.
In 2025, automated bots scan for weak points 24/7.
Fix it:
- Assume you are a target
- Prioritize basic cyber hygiene
- Monitor your network like it will be breached
4. Relying on Antivirus Alone
Modern threats like ransomware, zero-days, and phishing bypass most antivirus software easily.
Fix it:
- Use a layered security model (EDR, firewalls, DNS filtering)
- Educate your team on spotting threats (see mistake #6)
- Consider a Managed Detection and Response (MDR) provider
5. Skipping Software Updates and Patches
If you’re not patching, you’re handing attackers the keys. Unpatched software is a top entry point.
Fix it:
- Enable automatic updates for operating systems and apps
- Schedule regular patch review cycles
- Don’t forget network devices like routers and printers
6. No Employee Security Training
Your people are your biggest attack surface. One wrong click can open the door.
Fix it:
- Implement quarterly cybersecurity awareness training
- Run phishing simulations
- Make security part of onboarding
7. No Incident Response Plan
If something happens today, do you know who’s in charge? Who you’ll call? What to do?
Fix it:
- Draft a basic incident response plan (even one page is better than nothing)
- Include contacts, containment steps, legal/reporting actions
- Review it annually
8. Using Personal Devices Without Security Controls (BYOD)
Bring Your Own Device policies can introduce massive risks without proper controls.
Fix it:
- Require encryption, remote wipe capability, and antivirus on all BYOD devices
- Segment networks (e.g., guest Wi-Fi vs. business-critical systems)
- Track device access logs
9. No Website or Email Security Measures
Your domain is often your customer’s first touchpoint. If attackers spoof it, your reputation suffers.
Fix it:
- Use SPF, DKIM, and DMARC on email servers
- Install an SSL certificate on your website (https://)
- Use a Web Application Firewall (WAF) for public-facing systems
10. Thinking Cybersecurity Is an IT Problem, Not a Business One
Cybersecurity affects operations, reputation, finances, and legal standing. It’s not just about tech—it’s about risk.
Fix it:
- Make security part of strategic business discussions
- Assign ownership beyond just “the IT guy”
- Review cyber insurance options regularly
Final Thoughts
In 2025, cybercrime is more automated, targeted, and devastating than ever.
But here’s the good news: you don’t need to be a Fortune 500 company to protect yourself.
Most of the changes I listed are low-cost or even free—and they could save your business from disaster.
If you take just one step today, let it be this:
👉 Schedule a cybersecurity audit or self-check using this list.
Need help evaluating your risks or building a simple, customized cyber plan? I’m here to help.
Stay secure,
Joe Seanor
CISSP | Private Cybersecurity Consultant