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InsightDec 14, 2025·7 min read

Shadow Vendors: The Third Parties Hiding in Your Stack

Procurement doesn't see them. IT doesn't own them. But they still process your data. Here's how to bring shadow vendors into your TPRM program.

MB

Marcus Böhm

Field CISO

Shadow Vendors: The Third Parties Hiding in Your Stack

Every mature security program eventually hits the same wall: the vendors it tracks are a fraction of the vendors it actually depends on.

How Shadow Vendors Appear

  • A team signs up for a free tier that graduates to production.
  • A contractor introduces a tool that outlives their engagement.
  • A SaaS product adds a sub-processor without notifying customers.

Discovery, Then Triage

Pull vendor signal from SSO logs, expense data and email metadata. Triage by data sensitivity, not alphabetical order.

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