CVE-2026-20940
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2026-20940 is fixed in 28 products on 1 platform, first by KB5073722, released January 13, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.8
Important
Exploitation
None reported
Exploitation Unlikely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0046
39th percentile
<p>Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| Windows 10 Version 1607 for 32-bit Systems | 14393.8783 | KB5073722 | Jan 13, 2026 |
| Windows 10 Version 1607 for x64-based Systems | 14393.8783 | KB5073722 | Jan 13, 2026 |
| Windows 10 Version 1809 for 32-bit Systems | 17763.8276 | KB5073723 | Jan 13, 2026 |
| Windows 10 Version 1809 for x64-based Systems | 17763.8276 | KB5073723 | Jan 13, 2026 |
| Windows 10 Version 21H2 for 32-bit Systems | KB5073724 | Jan 13, 2026 | |
| Windows 10 Version 21H2 for ARM64-based Systems | KB5073724 | Jan 13, 2026 | |
| Windows 10 Version 21H2 for x64-based Systems | KB5073724 | Jan 13, 2026 | |
| Windows 10 Version 22H2 for 32-bit Systems | KB5073724 | Jan 13, 2026 | |
| Windows 10 Version 22H2 for ARM64-based Systems | KB5073724 | Jan 13, 2026 | |
| Windows 10 Version 22H2 for x64-based Systems | KB5073724 | Jan 13, 2026 | |
| Windows 11 Version 23H2 for ARM64-based Systems | 22631.6491 | KB5073455 | Jan 13, 2026 |
| Windows 11 Version 23H2 for x64-based Systems | 22631.6491 | KB5073455 | Jan 13, 2026 |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | KB5073699 | Jan 13, 2026 | |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | KB5073695 | Jan 13, 2026 | |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | KB5073699 | Jan 13, 2026 | |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | KB5073695 | Jan 13, 2026 | |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | KB5073700 | Jan 13, 2026 | |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | KB5073697 | Jan 13, 2026 | |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | KB5073700 | Jan 13, 2026 | |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | KB5073697 | Jan 13, 2026 | |
| Windows Server 2008 for x64-based Systems Service Pack 2 | KB5073700 | Jan 13, 2026 | |
| Windows Server 2008 for x64-based Systems Service Pack 2 | KB5073697 | Jan 13, 2026 | |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | KB5073700 | Jan 13, 2026 | |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | KB5073697 | Jan 13, 2026 | |
| Windows Server 2012 | KB5073698 | Jan 13, 2026 | |
| Windows Server 2012 (Server Core installation) | KB5073698 | Jan 13, 2026 | |
| Windows Server 2012 R2 | KB5073696 | Jan 13, 2026 | |
| Windows Server 2012 R2 (Server Core installation) | KB5073696 | Jan 13, 2026 | |
| Windows Server 2016 | 14393.8783 | KB5073722 | Jan 13, 2026 |
| Windows Server 2016 (Server Core installation) | 14393.8783 | KB5073722 | Jan 13, 2026 |
| Windows Server 2019 | 17763.8276 | KB5073723 | Jan 13, 2026 |
| Windows Server 2019 (Server Core installation) | 17763.8276 | KB5073723 | Jan 13, 2026 |
| Windows Server 2022 | 20348.4648 | KB5073457 | Jan 13, 2026 |
| Windows Server 2022 (Server Core installation) | 20348.4648 | KB5073457 | Jan 13, 2026 |
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