Vendor access in law firms: where IAM controls are breaking down

TL;DR: Law firms face a recurring breach pattern in which third-party vendors, remote support tools, VPNs, API keys, and file-transfer workflows create a broad entry surface for attackers, with third-party involvement appearing in about 30% of breaches according to the DBIR 2025. The real problem is not vendor access itself but governing it with explicit scope, traceability, and offboarding discipline.

NHIMG editorial — based on content published by Imprivata: third-party vendor access best practices for law firms

By the numbers:

• Third-party involvement in about 30% of breaches reflects the expanding supplier ecosystem.
• 47% of respondents experienced a data breach or cyberattack in the past year stemming from third-party vendors.
• A 2024 industry survey reported roughly 4 in 10 law firms experienced a security breach in the prior year.

Questions worth separating out

Q: How should law firms govern third-party vendor access without blocking operations?

A: Law firms should govern vendor access with task-specific entitlements, short-lived sessions, and full session attribution.

Q: Why do third-party vendor accounts create such a high breach risk?

A: Third-party accounts become risky when they inherit trust across VPNs, remote support tools, or file-transfer platforms and remain active after the original task ends.

Q: What breaks when vendor offboarding is not tied to identity lifecycle controls?

A: Dormant vendor accounts stay live, contracts end without revocation, and access becomes an orphaned pathway into sensitive systems.

Practitioner guidance

• Map every vendor access path to the data it can actually reach Inventory VPNs, remote desktops, API keys, file-transfer workflows, and support portals, then tie each path to the systems and client data classes it can reach.
• Split vendor entitlements by task, not by job title Create separate access profiles for maintenance, e-discovery, document handling, and file transfer so no single vendor account carries broad cross-functional privilege.
• Bind access expiry to contract expiry and inactivity Automate removal when a contract ends, when a service is retired, or when an account is unused for a defined operational threshold.

What's in the full article

Imprivata's full article covers the operational detail this post intentionally leaves for the source:

• A practical breakdown of eight vendor-access controls for law firms, including where each one fits in the access lifecycle.
• Examples of how to document due diligence, contract clauses, and pass-through obligations for third-party providers.
• Vendor access patterns such as self-registration, credential vaulting, and session recording that implementation teams will need to evaluate.
• The source's product-specific description of how Imprivata structures vendor privileged access for privileged assets.

👉 Read Imprivata's guidance on securing law firm vendor access →

Vendor access in law firms: where IAM controls are breaking down?

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