Vendor Risk Management: Keeping Third-Party Access Under Control

Ask who has access to your business data and you will probably name your staff. Now add the accounting platform, the payroll provider, the CRM vendor, the website agency, the courier portal, your IT provider, and the contractor who set up the phone system. Each is a door into your information, and you do not control how well any of them are locked.

Vendor risk management is the discipline of knowing who those suppliers are, what they can reach, and what happens if one of them fails or is breached. It sounds like a task for large companies, but small businesses face the same exposure with fewer resources to absorb a loss.

Why vendors matter

• A supplier breach can expose your data even if your own systems are flawless.
• A vendor with remote access to your network can become an entry point for attackers.
• Clients, insurers and regulators increasingly hold you responsible for how your suppliers handle information you gave them.
• Some cyber insurance requirements now ask about how you manage third parties.

A simple process that works

1. List your vendors

Start with a spreadsheet: vendor, what they do, what data they hold, how they connect to you, and who in your business owns the relationship. You will likely find suppliers you had forgotten.

2. Rank them by risk

Not every supplier needs the same scrutiny. Rank them by what they can access and how bad it would be if they failed.

3. Ask the right questions

For higher risk vendors, ask how they protect your data:

• Do they enforce multi-factor authentication for staff and for your accounts?
• Where is the data stored, and is it encrypted?
• Do they have a documented incident response and breach notification process?
• Do they carry out an IT security audit or assessment regularly, and align to standards like the CIS controls?
• Who at the vendor can access your data, and how is that logged?

Look for plain, specific answers. Vague reassurance is a warning sign.

4. Limit what vendors can reach

Give each supplier only the access they need, for only as long as they need it. Use named accounts, never shared logins. For vendors who connect to your network, restrict access by device and time using conditional access or equivalent rules, and require MFA. Remove accounts promptly when a project ends.

5. Put it in the contract

Contracts should cover breach notification timelines, security responsibilities, data return or deletion at the end, and your right to ask for evidence. Your lawyer should review anything significant.

6. Review regularly

Set a yearly review for high risk vendors and check access lists every quarter. Change in a supplier’s ownership, location or service is a prompt to look again.

Your IT provider is a vendor too

Managed service providers have deep access by design, so they deserve the most scrutiny of all. Ask yours about staff vetting, tool security, access logging and how they would tell you about an incident. We welcome those questions at Infinity, and our managed IT services agreements spell out responsibilities.

When a vendor is breached

Have a short plan: who finds out, how you assess what of yours was involved, how you reset shared credentials, and how you tell affected clients. This slots into your wider data breach prevention plan.

Frequently asked questions

Do small businesses really need vendor assessments?

A lightweight version, a vendor list, tiering and a few questions for high risk suppliers, is realistic and worthwhile at any size.

What if a vendor refuses to answer security questions?

Treat that as information. For high risk suppliers, consider alternatives or limit what you share.

How often should we review vendors?

Review high risk vendors yearly and check access lists quarterly.

Related service: Strategic IT Consulting

Last updated October 23, 2026