CVE-2026-21221

HIGH

Capability Access Management Service - Privilege Escalation

Title source: llm

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.

References (1)

[Vendor Advisory] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21221

Scores

CVSS v3 7.0

EPSS 0.0005

EPSS Percentile 14.2%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/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 (7)

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 2025 10.0.26100.0 - 10.0.26100.32230

Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.32230

microsoft/windows_11_24h2 < 10.0.26100.7623 (2 CPE variants)

microsoft/windows_11_25h2 < 10.0.26200.7623 (2 CPE variants)

microsoft/windows_server_2025 < 10.0.26100.32230

Published Jan 13, 2026

Tracked Since Feb 18, 2026