CVE-2026-20858
Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20858 is fixed in 21 products on 1 platform, first by KB5073723, released January 13, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.8
Important
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0029
22nd percentile
<p>Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| 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 11 Version 24H2 for ARM64-based Systems | KB5074109 | Jan 13, 2026 | |
| Windows 11 Version 24H2 for x64-based Systems | KB5074109 | Jan 13, 2026 | |
| Windows 11 Version 25H2 for ARM64-based Systems | KB5074109 | Jan 13, 2026 | |
| Windows 11 Version 25H2 for x64-based Systems | KB5074109 | 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 |
| Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.2092 | KB5073450 | Jan 13, 2026 |
| Windows Server 2025 | 26100.32230 | KB5073379 | Jan 13, 2026 |
| Windows Server 2025 (Server Core installation) | 26100.32230 | KB5073379 | Jan 13, 2026 |
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