CVE-2026-21234

HIGH

Windows Connected Devices Platform Service - Privilege Escalation

Title source: llm

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Connected Devices Platform Service allows an authorized attacker to elevate privileges locally.

References (1)

[Vendor Advisory] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21234

Scores

CVSS v3 7.0

EPSS 0.0002

EPSS Percentile 4.5%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-362

Status published

Affected Products (18)

microsoft/windows_10_1809 < 10.0.17763.8389

microsoft/windows_10_1809 < 10.0.17763.8389

microsoft/windows_10_21h2 < 10.0.19044.6937

microsoft/windows_10_21h2 < 10.0.19044.6937

microsoft/windows_10_21h2 < 10.0.19044.6937

microsoft/windows_10_22h2 < 10.0.19045.6937

microsoft/windows_10_22h2 < 10.0.19045.6937

microsoft/windows_10_22h2 < 10.0.19045.6937

microsoft/windows_11_23h2 < 10.0.22631.6649

microsoft/windows_11_23h2 < 10.0.22631.6649

microsoft/windows_11_24h2 < 10.0.26100.7781

microsoft/windows_11_24h2 < 10.0.26100.7781

microsoft/windows_11_25h2 < 10.0.26200.7781

microsoft/windows_11_25h2 < 10.0.26200.7781

microsoft/windows_server_2019 < 10.0.17763.8389

... and 3 more

Timeline

Published Feb 10, 2026

Tracked Since Feb 18, 2026