CVE-2026-20877

HIGH

Windows Management Services - Privilege Escalation

Title source: llm
STIX 2.1

Description

Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.

References (1)

Scores

CVSS v3 7.8
EPSS 0.0003
EPSS Percentile 6.9%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-362 CWE-416
Status published
Products (23)
Microsoft/Windows 10 Version 1809 10.0.17763.0 - 10.0.17763.8276
Microsoft/Windows 10 Version 21H2 10.0.19044.0 - 10.0.19044.6809
Microsoft/Windows 10 Version 22H2 10.0.19045.0 - 10.0.19045.6809
Microsoft/Windows 11 version 22H3 10.0.22631.0 - 10.0.22631.6491
Microsoft/Windows 11 Version 23H2 10.0.22631.0 - 10.0.22631.6491
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.7623
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.7623
Microsoft/Windows Server 2019 10.0.17763.0 - 10.0.17763.8276
Microsoft/Windows Server 2019 (Server Core installation) 10.0.17763.0 - 10.0.17763.8276
Microsoft/Windows Server 2022 10.0.20348.0 - 10.0.20348.4648
... and 13 more
Published Jan 13, 2026
Tracked Since Feb 18, 2026