CVE-2026-50508
Medium CVSS 6.5Published 2026-06-09 ยท last changed 2026-07-23
The fix
Microsoft fixes this in updatesKB5094122, KB5093998, KB5094042, KB5094041, KB5094128, KB5094127. The fixed build differs per Windows version, so the row that matters is the one matching the machine you are looking at.
| Windows version | Fixed in build | Update | Released |
|---|---|---|---|
| Windows 10 Version 1607 for 32-bit Systems | 10.0.14393.9234 | KB5094122 | 2026-09-19 |
| Windows 10 Version 1607 for x64-based Systems | 10.0.14393.9234 | KB5094122 | 2026-09-19 |
| Windows 11 Version 22H2 for ARM64-based Systems | 10.0.22631.7219 | KB5093998 | 2026-09-19 |
| Windows 11 Version 22H2 for x64-based Systems | 10.0.22631.7219 | KB5093998 | 2026-09-19 |
| Windows Server 2012 | 6.2.9200.26132 | KB5094042 | 2026-09-19 |
| Windows Server 2012 R2 | 6.3.9600.23228 | KB5094041 | 2026-09-19 |
| Windows Server 2012 R2 (Server Core installation) | 6.3.9600.23228 | KB5094041 | 2026-09-19 |
| Windows Server 2012 (Server Core installation) | 6.2.9200.26132 | KB5094042 | 2026-09-19 |
| Windows Server 2016 | 10.0.14393.9234 | KB5094122 | 2026-09-19 |
| Windows Server 2016 (Server Core installation) | 10.0.14393.9234 | KB5094122 | 2026-09-19 |
| Windows Server 2022 | 10.0.20348.5256 | KB5094128 | 2026-09-19 |
| Windows Server 2022 (Server Core installation) | 10.0.20348.5256 | KB5094128 | 2026-09-19 |
| Windows Server, version 2004 (Server Core installation) | 10.0.19045.7417 | KB5094127 | 2026-09-19 |
Having the KB is not the same as knowing whether a machine has it. Windows updates supersede each other, so the update you installed often covers a fix that shipped in an earlier one. Paste your build into the patch checker and it walks that chain for you.
What it is
Exposure of sensitive information to an unauthorized actor in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
Sources
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N