Most business security incidents do not start with a “Hollywood hack.” They start with access. The wrong person has the wrong permissions. A vendor account is left enabled after a project ends. An employee has admin rights they no longer need. And when a single credential gets compromised, the attacker can move fast because the access is already there.
This week’s Security Tip of the Week is about a high-impact control that many SMBs overlook: least privilege and tight control of admin and vendor access.
If you want to reduce the blast radius of any incident, this is one of the best places to start.
Why this matters for SMB cybersecurity
When attackers gain access to a standard user account, damage is often limited. When they gain access to an admin account, everything changes. Admin privileges can allow attackers to:
- Create new accounts and hide them
- Disable security tools
- Access sensitive files and email
- Change backup settings
- Deploy ransomware across multiple devices
- Manipulate financial workflows and approvals
Vendors can create similar risk. Many businesses grant vendor access for IT, accounting platforms, marketing tools, or line-of-business apps. Over time those accounts pile up, permissions stay too broad, and nobody is sure who still has access.
This is why least privilege matters: it reduces what a compromised account can do.
External resources:
- NIST overview of access control concepts: https://csrc.nist.gov/projects/abac
- CISA general guidance for businesses (includes identity and access fundamentals): https://www.cisa.gov/cyber-guidance-small-businesses
The tip: implement least privilege in 30 minutes (and improve it weekly)
Least privilege simply means: users and vendors should only have the access they need, for only as long as they need it.
Here’s a practical approach you can run this week.
Step 1: Identify your “power accounts”
Make a short list of accounts that can cause outsized damage:
- Microsoft 365 global admins (or Google Workspace super admins)
- Domain admins (if you have on-prem Active Directory)
- Admin accounts for firewall, backup systems, and endpoint security
- Accounting system admins (QuickBooks, payroll platforms)
- CRM admins
- Any admin access shared across multiple people
If you don’t know where these live, that’s your first red flag.
Internal link: Learn how Coretech Now approaches security-first IT
https://coretechnow.com/cybersecurity
Step 2: Separate admin accounts from daily-use accounts
One of the most common mistakes is using the same account for day-to-day email and admin tasks. If that inbox gets compromised, the attacker inherits admin access.
Best practice:
- Use a standard account for daily work (email, docs, teams)
- Use a separate admin account only when needed
- Do not check email on the admin account
- Protect admin accounts with strong MFA and extra controls
External reference (Microsoft identity security concepts):
https://learn.microsoft.com/en-us/security/privileged-access-workstations/privileged-access-strategy
Step 3: Remove local admin rights from employee devices
Most users do not need local admin access on laptops/desktops. Local admin rights are a common path to malware installation, persistence, and lateral movement.
Action:
- Review who has local admin rights
- Remove it by default
- Use temporary elevation tools only when required
This one change can eliminate a huge category of preventable incidents.
Internal link: Managed IT that includes monitoring, controls, and policy enforcement
Step 4: Audit vendor access and set expiration
Vendor access should never be “set it and forget it.”
Do this:
- List every vendor with access (IT, software providers, consultants)
- Confirm what they can access (apps, servers, email, VPN)
- Disable accounts that are no longer needed
- Add expiration dates for access by default
- Require MFA for every vendor account
- Avoid shared logins (each vendor user should have their own account)
External reference (CISA supply chain and third-party risk concepts):
https://www.cisa.gov/supply-chain
Step 5: Turn on alerts for privileged activity
Even a basic alerting rule can help you catch account takeover quickly.
Examples:
- Alert on new admin accounts created
- Alert on MFA changes
- Alert on mailbox forwarding rules (email exfiltration)
- Alert on sign-ins from unusual locations or devices
- Alert on backup deletion attempts
If you don’t have visibility into privileged actions, you often learn about an incident after damage is done.
A simple weekly checklist: keep access clean
Use this “Security Tip of the Week” checklist every Friday:
- Review admin accounts (any new ones?)
- Disable accounts for terminated employees immediately
- Remove vendor accounts not used in the last 30 to 60 days
- Confirm MFA is enabled for all privileged users
- Check for unusual mailbox rules or forwarding
- Confirm no one “accidentally” became an admin
These checks take minutes and reduce risk dramatically.
Common mistakes that increase risk
Mistake 1: Shared admin logins
Shared credentials kill accountability and make investigations painful. Every admin action should be tied to a person.
Mistake 2: Vendors with permanent access
Vendor access should be time-bound. If the project ended, the access ends.
Mistake 3: Too many admins
If everyone is an admin, nobody is secure. Admin access should be rare and intentional.
Mistake 4: No offboarding process
A former employee with access is not just an HR issue. It’s a security incident waiting to happen.
How this ties to backups and recovery
Least privilege is also critical for protecting backups. Many ransomware crews try to delete or encrypt backups first. If backup admin access is too broad, one compromised credential can wipe out your recovery plan.
If you want to strengthen your resilience, pair this week’s tip with a recovery-focused control.
Internal link: Backup and disaster recovery services
https://coretechnow.com/backup-disaster-recovery
How Coretech Now helps
At Coretech Now, we implement least privilege and access controls as part of a broader security-first managed IT approach. That includes:
- Admin account separation and hardening
- Vendor access policies and time-bound permissions
- MFA enforcement and identity security
- Endpoint controls and monitoring
- Security logging, alerting, and response support
- Backup protection and recovery planning
If you want a second set of eyes on who has access to what (and where your biggest exposure is), we can help you prioritize fixes that actually reduce risk. https://coretechnow.com/contact/
