Windows Server 2025 local users on domain-joined member servers must not be enumerated.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-278179 | WN25-MS-000030 | SV-278179r1182284_rule | CCI-000381 | medium |
| Description | ||||
| The username is one part of logon credentials that could be used to gain access to a system. Preventing the enumeration of users limits this information to authorized personnel. | ||||
| STIG | Date | |||
| Microsoft Windows Server 2025 Security Technical Implementation Guide | 2026-02-20 | |||
Details
Check Text (C-278179r1182284_chk)
This applies to member servers. For domain controllers and stand-alone or nondomain-joined systems, this is not applicable.
If the following registry value does not exist or is not configured as specified, this is a finding:
Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Policies\Microsoft\Windows\System\
Value Name: EnumerateLocalUsers
Type: REG_DWORD
Value: 0x00000000 (0)
Fix Text (F-82614r1181242_fix)
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> Enumerate local users on domain-joined computers to "Disabled".