CVE-2026-20923

EUVD-2026-2121
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.8 HIGH
LOCAL
HIGH
LOW
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
microsoftCNA
7.8 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
Base Score
CVSS 3.x
EPSS Score
Percentile: 7%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_10_1809
𝑥
< 10.0.17763.8276
microsoftwindows_10_1809
𝑥
< 10.0.17763.8276
microsoftwindows_10_21h2
𝑥
< 10.0.19044.6809
microsoftwindows_10_22h2
𝑥
< 10.0.19045.6809
microsoftwindows_11_23h2
𝑥
< 10.0.22631.6491
microsoftwindows_11_24h2
𝑥
< 10.0.26100.7623
microsoftwindows_11_25h2
𝑥
< 10.0.26200.7623
microsoftwindows_server_2019
𝑥
< 10.0.17763.8276
microsoftwindows_server_2022
𝑥
< 10.0.20348.4648
microsoftwindows_server_2022_23h2
𝑥
< 10.0.25398.2092
microsoftwindows_server_2025
𝑥
< 10.0.26100.32230
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows 10
1809 (x64, x86)
KB5073723
21H2 (arm64, x64, x86)
KB5073724
22H2 (arm64, x64, x86)
KB5073724
Windows 11
23H2 (arm64, x64)
KB5073455
24H2 (arm64, x64)
KB5074109
25H2 (arm64, x64)
KB5074109
Windows Server 2019
Server Core
KB5073723
Standard
KB5073723
Windows Server 2022
23H2 Server Core
KB5073450
Server Core
KB5073457
Standard
KB5073457
Windows Server 2025
Server Core
KB5073379
Standard
KB5073379
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20923