Unrated severityNVD Advisory· Published Feb 10, 2026· Updated Apr 10, 2026

Windows NTLM Spoofing Vulnerability

CVE-2026-21249

Description

External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing locally.

Microsoft/Windows 10 1607cpe-rescue3 versions
10.0.14393.0+ 2 more
- (no CPE)range: 10.0.14393.0
- (no CPE)range: 10.0.19044.0
- (no CPE)range: 10.0.19045.0
Microsoft/Windows 10 1809cpe-rescue
Range: 10.0.17763.0
Microsoft/Windows 11 version 22H3v5
Range: 10.0.22631.0
Microsoft/Windows 11 23h2cpe-rescue
Range: 10.0.22631.0
Microsoft/Windows 11 24h2cpe-rescue
Range: 10.0.26100.0
Microsoft/Windows 11 25h2cpe-rescue
Range: 10.0.26200.0
Microsoft/Windows 11 26h1cpe-rescue
Range: 10.0.28000.0
Microsoft/Windows Server 2012cpe-rescue
Range: 6.3.9600.0
Microsoft/Windows Server 2012 R2 (Server Core installation)v5
Range: 6.3.9600.0
Microsoft/Windows Server 2016cpe-rescue
Range: 10.0.14393.0
Microsoft/Windows Server 2016 (Server Core installation)v5
Range: 10.0.14393.0
Microsoft/Windows Server 2019cpe-rescue
Range: 10.0.17763.0
Microsoft/Windows Server 2019 (Server Core installation)v5
Range: 10.0.17763.0
Microsoft/Windows Server 2003cpe-rescue
Range: 10.0.20348.0
Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation)v5
Range: 10.0.25398.0
Microsoft/Windows Server 2025cpe-rescue
Range: 10.0.26100.0
Microsoft/Windows Server 2025 (Server Core installation)v5
Range: 10.0.26100.0

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