Posture check · Account security
Built-in Guest account enabled (T1078.001)
The built-in Guest account (RID 501) needs no password.
Why it matters
Anyone can log on as Guest and start from inside the domain.
How GraphnAI finds it
It runs after every sync, on each connected domain or tenant on its own. It applies to Active Directory.
It reads:
- The directory attributes
objectSidandaccountEnabled
Tiered Fidelity™ level: Theoretical
Every finding from this check carries the Theoretical level.
- TheoreticalThis checkConfigured in the directory. Nothing else checked.
- ConstrainedA constraint on it has been checked.
- ValidatedTelemetry has seen it in use.
How Select Fire™ fixes it
How to fix it
Disable the built-in Guest account.
What Select Fire changes
Select Fire opens from the finding and simulates each change on your live graph before anything changes in your directory.
- Disable user For user accounts and service accounts.Semi-Auto, or Full-Auto when an Admin allows this action and every Full-Auto check passes. Never on a Tier 0 or Tier 1 account.
Disabling Guest closes the passwordless logon path. Anything that relies on Guest access stops working.
MITRE ATT&CK® technique names and MITRE D3FEND™ technique labels: © The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. ATT&CK® is a registered trademark and D3FEND™ a trademark of The MITRE Corporation.
See it on your own directory.
The Public Preview is free for 30 days from your first sync, on your own server.