CVE-2026-50508 - Vulnerability Details

- Windows NTLM Spoofing Vulnerability

Description

Exposure of sensitive information to an unauthorized actor in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.

Published: 2026-06-09

Score: 6.5 Medium

EPSS: n/a

KEV: No

Impact:

Action:

Analysis

Impact

This vulnerability exposes sensitive information through Windows NTLM authentication, permitting an attacker to spoof authentication over a network and impersonate legitimate machines or users. The effect is a loss of confidentiality and potential unauthorized access, matching CWE-200.

Affected Systems

Microsoft Windows 10 1607, Windows 11 22H2, Windows Server 2012, 2012 R2, 2016, 2022, and Windows Server 2004 are affected across both x86 and arm64 platforms as specified in the CNA affected‑version list.

Risk and Exploitability

The CVSS score of 6.5 indicates moderate severity. EPSS data is not available, and the vulnerability is not listed in CISA’s KEV catalog. The attack vector is likely a network‑based, unauthenticated attacker who can send NTLM traffic and receive spoofed responses, allowing impersonation of other endpoints on the same network.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

Windows 10 Version 1607

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9234

Microsoft

Windows 11 version 22H2

affected

Version	Status	Constraints
`10.0.22621.0`	affected	< 10.0.22631.7219

Microsoft

Windows Server 2012

affected

Version	Status	Constraints
`6.2.9200.0`	affected	< 6.2.9200.26132

Microsoft

Windows Server 2012 (Server Core installation)

affected

Version	Status	Constraints
`6.2.9200.0`	affected	< 6.2.9200.26132

Microsoft

Windows Server 2012 R2

affected

Version	Status	Constraints
`6.3.9600.0`	affected	< 6.3.9600.23228

Microsoft

Windows Server 2012 R2 (Server Core installation)

affected

Version	Status	Constraints
`6.3.9600.0`	affected	< 6.3.9600.23228

Microsoft

Windows Server 2016

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9234

Microsoft

Windows Server 2016 (Server Core installation)

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9234

Microsoft

Windows Server 2022

affected

Version	Status	Constraints
`10.0.20348.0`	affected	< 10.0.20348.5256

Microsoft

Windows Server version 2004

affected

Version	Status	Constraints
`10.0.0`	affected	< 10.0.19045.7417

No data.

Vendor Product Confidence Versions

Microsoft

Windows 10 1607

86%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9234)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Windows 11 22h2

86%

Version	Status	Scheme	Platform
`[10.0.22621.0,10.0.22631.7219)`	affected	generic	['arm64-based_systems', 'x64-based_systems']

Microsoft

Windows Server 2004

88%

Version	Status	Scheme	Platform
`[10.0.0,10.0.19045.7417)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012

100%

Version	Status	Scheme	Platform
`[6.2.9200.0,6.2.9200.26132)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[6.2.9200.0,6.2.9200.26132)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 R2

100%

Version	Status	Scheme	Platform
`[6.3.9600.0,6.3.9600.23228)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 R2 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[6.3.9600.0,6.3.9600.23228)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2016

100%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9234)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2016 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9234)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2022

100%

Version	Status	Scheme	Platform
`[10.0.20348.0,10.0.20348.5256)`	affected	generic	['x64-based_systems']

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Apply the latest Microsoft security update that addresses CVE-2026-50508
Disable NTLM authentication on critical systems and use Kerberos whenever possible
Restrict NTLM traffic with firewall rules so it is allowed only between trusted internal networks

Generated by OpenCVE AI on June 9, 2026 at 20:19 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50508

History

Wed, 10 Jun 2026 11:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Microsoft windows 11 22h2 Microsoft windows Server 2012 (server Core Installation) Microsoft windows Server 2012 R2 Microsoft windows Server 2012 R2 (server Core Installation) Microsoft windows Server 2016 (server Core Installation)
Vendors & Products		Microsoft windows 11 22h2 Microsoft windows Server 2012 (server Core Installation) Microsoft windows Server 2012 R2 Microsoft windows Server 2012 R2 (server Core Installation) Microsoft windows Server 2016 (server Core Installation)

Tue, 09 Jun 2026 18:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Tue, 09 Jun 2026 17:15:00 +0000

Type	Values Removed	Values Added
Description		Exposure of sensitive information to an unauthorized actor in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
Title		Windows NTLM Spoofing Vulnerability
First Time appeared		Microsoft Microsoft windows 10 1607 Microsoft windows 11 22h2 Microsoft windows Server 2004 Microsoft windows Server 2012 Microsoft windows Server 2012 R2 Microsoft windows Server 2016 Microsoft windows Server 2022
Weaknesses		CWE-200
CPEs		cpe:2.3:o:microsoft:windows_10_1607:::::::x86:* cpe:2.3:o:microsoft:windows_11_22H2:::::::arm64:* cpe:2.3:o:microsoft:windows_server_2004:::::::: cpe:2.3:o:microsoft:windows_server_2012:::::::x64:* cpe:2.3:o:microsoft:windows_server_2012_R2:::::::x64:* cpe:2.3:o:microsoft:windows_server_2016:::::::: cpe:2.3:o:microsoft:windows_server_2022::::::::
Vendors & Products		Microsoft Microsoft windows 10 1607 Microsoft windows 11 22h2 Microsoft windows Server 2004 Microsoft windows Server 2012 Microsoft windows Server 2012 R2 Microsoft windows Server 2016 Microsoft windows Server 2022
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50508
Metrics		cvssV3_1 `{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}`

Subscriptions

Microsoft Windows 10 1607 Windows 11 22h2 Windows 11 22h2 Windows Server 2004 Windows Server 2012 Windows Server 2012 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2022

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-06-09T17:05:17.278Z

Updated: 2026-06-09T21:50:31.412Z

Reserved: 2026-06-04T19:00:41.292Z

Link: CVE-2026-50508

Vulnrichment

Updated: 2026-06-09T18:02:50.558Z

NVD

Status : Awaiting Analysis

Published: 2026-06-09T17:17:50.027

Modified: 2026-06-09T19:32:51.440

Link: CVE-2026-50508

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-06-10T11:15:05Z

Weaknesses

CWE-200

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction Required

Exploitation none

Automatable no

Technical Impact partial

Subscriptions

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