Vendor Access Management for Small Businesses: A Third-Party Access Checklist

A vendor account often starts with a legitimate request: troubleshoot an application, maintain a device, support a server, access a cloud portal, or complete a project.

The risk begins when that access stays broader or longer than the job requires.

Vendor access management is the process of deciding which third parties can access business systems, what they can reach, how they authenticate, how activity is monitored, and when access is removed.

SMART Solutions provides Cybersecurity Protection focused on devices, access, network exposure, and practical risk reduction. A Network & Security Assessment can also help identify remote-access paths, administrator accounts, and technology gaps before changes are prioritized.

Quick answer: what should vendor access management include?

A small business should be able to answer:

• Which vendors have accounts or remote connectivity?
• Who approved each access path?
• Which systems and data can each vendor reach?
• Does the vendor use an individual identity or a shared account?
• Is MFA required where supported?
• Is access always enabled or activated only when needed?
• Are privileged actions and remote sessions logged?
• When was each vendor's access last reviewed?
• Who removes access when a project or contract ends?

The FTC advises businesses to give vendors access on a need-to-know basis and only for the time needed to perform the work. NIST CSF 2.0 also emphasizes least privilege and periodic review of access permissions.

Sources: FTC — Cybersecurity for Small Business and NIST CSF 2.0 Implementation Examples.

1. Build a vendor-access inventory

Start by listing every third party with technical access, not just the vendors your IT team immediately remembers.

That may include:

• Managed IT or support providers
• Software vendors
• Accountants or payroll providers
• Website or marketing agencies
• Security integrators
• Telecom and VoIP vendors
• Cloud consultants
• Equipment manufacturers
• Contractors and project specialists

For each relationship, record the business owner, technical owner, account name, systems accessible, privilege level, authentication method, remote-access method, approval date, and expected end date.

Our IT asset inventory guide can help identify the platforms, devices, cloud services, and management systems that need to be checked.

2. Avoid shared vendor identities when individual accounts are available

A login named Vendor, Support, or Admin makes it difficult to know which person performed an action.

When the system supports named user accounts, create individual identities for vendor personnel who need access. That improves accountability and makes offboarding easier when the vendor’s staff changes.

Some devices or legacy systems may only support a shared technical account. If so, document who controls it, where the credential is stored, how access is approved, and when the password or secret must be rotated.

3. Grant the minimum access required

A vendor troubleshooting a printer should not automatically gain access to financial files, backups, security cameras, or domain administration.

Ask:

• Which exact system is required?
• Does the vendor need read-only, configuration, or administrator rights?
• Does access need to cross network segments?
• Is access needed permanently or only during a service window?
• Can sensitive data be excluded from the vendor's scope?

The FTC’s vendor-security guidance recommends limiting third-party access to what is needed and for only as long as necessary.

Source: FTC — Vendor Security.

4. Require stronger authentication for remote and privileged access

Vendor credentials are still credentials. If the account can administer business systems or connect remotely, treat it as high risk.

CISA recommends MFA for remote and privileged access and advises organizations to use the strongest MFA option available.

Source: CISA — Require Multifactor Authentication.

Where supported, enable MFA and avoid recovery methods that depend on an unknown vendor employee’s personal phone or email.

Our phishing-resistant MFA guide explains passkeys, security keys, WebAuthn, and the differences among authentication methods.

5. Control the remote-access path

Do not let every vendor choose a different unmanaged remote-control application.

Document approved methods such as VPN, vendor portal, remote-management platform, or another controlled support path. Define who can use it, what devices can connect, what systems are reachable, and whether the path remains enabled between support sessions.

The FTC recommends requiring employees and vendors to follow strong security standards before connecting remotely and including security provisions in vendor contracts.

Our business VPN and remote-access security checklist covers identity, device security, permissions, segmentation, logging, and offboarding in more detail.

6. Segment access where practical

Network segmentation can reduce the number of systems reachable from a vendor’s connection.

A camera vendor may need the camera network. A phone vendor may need the VoIP environment. A software vendor may need one application server. Those needs do not automatically justify access to the entire office network.

See our network segmentation guide for a deeper explanation of trust boundaries and communication requirements.

7. Log meaningful vendor activity

The goal is not to record every mouse movement. The business should have enough evidence to answer important questions after a change or incident.

Depending on the system, retain useful records such as:

• Successful and failed logins
• Administrator changes
• Configuration changes
• New or disabled accounts
• Remote-session records
• Firewall or VPN connections
• File-access or export events for sensitive systems

CISA recommends using logging and monitoring to identify unusual activity on business systems.

Source: CISA — Use Logging on Business Systems.

8. Review vendor access on a recurring schedule

A contract can remain active while the original technical need disappears.

During an access review, ask the business owner to confirm that the vendor relationship is still active and that the current permissions are still required.

Review immediately when:

• A contract ends
• A project closes
• A vendor changes personnel
• A vendor reports a security incident
• The business changes platforms
• Administrator responsibilities change

Our user access review checklist provides a complementary process for employees, contractors, vendors, shared accounts, and privileged access.

9. Define the offboarding process before you need it

Vendor offboarding should include more than disabling one VPN account.

Check cloud portals, local accounts, firewall rules, API keys, service accounts, shared passwords, remote-management tools, physical access, security systems, phone systems, website administration, and documentation ownership.

If the vendor managed a critical platform, make sure the business retains administrative ownership before terminating access.

10. Include security expectations in the relationship

The FTC recommends putting vendor security expectations in writing and establishing a process to verify that vendors follow those requirements.

Those expectations may address access control, data handling, incident notification, security updates, retention, deletion, encryption, and subcontractors depending on the relationship.

Technology controls work best when they are reinforced by clear business ownership and contractual expectations.

Vendor access management FAQ

Should vendors have permanent VPN access?

Not automatically. Some ongoing support relationships may justify persistent access, while other work is better served by time-limited or on-demand access. The scope should follow the business need.

Is MFA enough to secure vendor access?

No. MFA is important, but it should be combined with least privilege, controlled remote access, logging, segmentation where appropriate, recurring review, and prompt offboarding.

Should every vendor get an administrator account?

No. Administrator rights should be granted only when the task requires them. Read-only or limited roles are often sufficient for diagnostics, reporting, or routine work.

What if a vendor insists on a shared account?

Document the limitation, control the credential, restrict the account’s permissions, log its use where possible, and review whether a safer supported method exists.

Authoritative sources

• FTC — Cybersecurity for Small Business
• FTC — Vendor Security
• FTC — Secure Remote Access
• NIST CSF 2.0 Implementation Examples
• CISA — Require Multifactor Authentication

Make third-party access deliberate

Vendor access should be easy to explain: who has it, why they need it, what they can reach, how they authenticate, how activity is reviewed, and when access ends.

If you need help mapping those paths, explore Cybersecurity Protection, request a Network & Security Assessment, or contact SMART Solutions.