CVE-2026-50508 — Windows NTLM Spoofing Vulnerability

Executive Summary

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

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

More Likely

MS Exploit Likelihood

Category Spoofing

Weakness CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Released Jun 9 2026

Last Updated Jun 9 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.0048 — 0.37581 percentile

NVD CVSS 7.5 HIGH — differs from MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.7

EPSS Score

0.0048

probability of exploitation in the next 30 days

0.37581 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

13 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1607 for 32-bit Systems	`5094122 (Security Update)`	Important	Spoofing	Yes
Windows 10 Version 1607 for x64-based Systems	`5094122 (Security Update)`	Important	Spoofing	Yes
Windows 11 Version 22H2 for ARM64-based Systems	`5093998 (Security Update)`	Important	Spoofing	Yes
Windows 11 Version 22H2 for x64-based Systems	`5093998 (Security Update)`	Important	Spoofing	Yes
Windows Server 2012	`5094042 (Monthly Rollup)`	Important	Spoofing	Yes
Windows Server 2012 (Server Core installation)	`5094042 (Monthly Rollup)`	Important	Spoofing	Yes
Windows Server 2012 R2	`5094041 (Monthly Rollup)`	Important	Spoofing	Yes
Windows Server 2012 R2 (Server Core installation)	`5094041 (Monthly Rollup)`	Important	Spoofing	Yes
Windows Server 2016	`5094122 (Security Update)`	Important	Spoofing	Yes
Windows Server 2016 (Server Core installation)	`5094122 (Security Update)`	Important	Spoofing	Yes
Windows Server 2022	`5094128 (Security Update)`	Important	Spoofing	Yes
Windows Server 2022 (Server Core installation)	`5094128 (Security Update)`	Important	Spoofing	Yes
Windows Server, version 2004 (Server Core installation)	`5094127 (Security Update)`	Important	Spoofing	Yes

Patches

6 patches

Article	Type	Restart
`5094122`	Security Update	Yes
`5093998`	Security Update	Yes
`5094042`	Monthly Rollup	Yes
`5094041`	Monthly Rollup	Yes
`5094128`	Security Update	Yes
`5094127`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Jonathan Lein of TrendAI Research with https://www.zerodayinitiative.com/

References

MSRC Advisory MITRE NVD