Microsoft Windows 11 Security Technical Implementation Guide

The Microsoft Windows 11 Security Technical Implementation Guide (V2 R11) has 257 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V2 · R11

CurrentPublished Wed Sep 30 2026

Insecure logons to an SMB server must be disabled.

Microsoft Windows 11 Security Technical Implementation Guide

Assessment Title

Rule Text

Insecure logons to an SMB server must be disabled.

Description

Discussion Text

Insecure guest logons allow unauthenticated access to shared folders. Shared resources on a system must require authentication to establish proper access.

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-253360

Rule

SV-253360r1268251_rule

Severity

medium

Rule Version

WN11-CC-000040

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

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\LanmanWorkstation\

Value Name: AllowInsecureGuestAuth

Type: REG_DWORD
Value: 0x00000000 (0)

Implementation Procedure

Fix Text

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Lanman Workstation >> "Enable insecure guest logons" to "Disabled".

STIG check 101 of 257 in the Microsoft Windows 11 STIG checklist

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