Every collaboration invite adds an identity to your environment that you do not fully control. Guest accounts from partners, contractors, and acquired companies accumulate in the directory, each carrying access to channels, files, and apps. Many were added for a project that ended months ago.
These identities sit in a blind spot. Joiner-mover-leaver processes are built for employees, so a guest rarely gets offboarded when the work wraps. Their home tenant, not yours, governs their password and MFA, which means their security posture is someone else's decision. And access reviews that cover staff often skip external users entirely.
The Trust You Extended Is the Trust an Attacker Inherits
When a partner's tenant is breached, the attacker does not need to break into yours. They sign in as the guest you already trust, with the access you already granted. The compromise happens next door and walks through the connecting door.
Baseline External Identities Too
Listing your risky third parties is a start, but a static inventory never tells you the moment one turns live. PeopleBase profiles external identities the same way it profiles staff, so a guest account that reaches past its original project, into finance files it was never invited near, stands out the instant it moves, even with valid credentials from a tenant you don't run.
You reviewed your employees this quarter. The identities you invited in deserve the same look.
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