Windows Server 2025 must be configured to prevent anonymous users from having the same permissions as the Everyone group.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-278218 | WN25-SO-000240 | SV-278218r1181360_rule | CCI-000366 | medium |
| Description | ||||
| Access by anonymous users must be restricted. If this setting is enabled, anonymous users have the same rights and permissions as the built-in Everyone group. Anonymous users must not have these permissions or rights. | ||||
| STIG | Date | |||
| Microsoft Windows Server 2025 Security Technical Implementation Guide | 2026-02-20 | |||
Details
Check Text (C-278218r1181360_chk)
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: \SYSTEM\CurrentControlSet\Control\Lsa\
Value Name: EveryoneIncludesAnonymous
Value Type: REG_DWORD
Value: 0x00000000 (0)
Fix Text (F-82653r1181359_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network access: Let Everyone permissions apply to anonymous users to "Disabled".