CVE-2026-20877

HIGH

Windows Management Services - Privilege Escalation

Title source: llm

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 6.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Classification

CWE
CWE-362 CWE-416
Status published

Affected Products (11)

microsoft/windows_10_1809 < 10.0.17763.8276
microsoft/windows_10_1809 < 10.0.17763.8276
microsoft/windows_10_21h2 < 10.0.19044.6809
microsoft/windows_10_22h2 < 10.0.19045.6809
microsoft/windows_11_23h2 < 10.0.22631.6491
microsoft/windows_11_24h2 < 10.0.26100.7623
microsoft/windows_11_25h2 < 10.0.26200.7623
microsoft/windows_server_2019 < 10.0.17763.8276
microsoft/windows_server_2022 < 10.0.20348.4648
microsoft/windows_server_2022_23h2 < 10.0.25398.2092
microsoft/windows_server_2025 < 10.0.26100.32230

Timeline

Published Jan 13, 2026
Tracked Since Feb 18, 2026