Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Published: 2026-01-13
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Local Privilege Escalation
Action: Immediate Patch
AI Analysis

Impact

A race condition in Windows Management Services caused by concurrent use of a shared resource without proper synchronization allows an attacker who already has local system access to temporarily gain elevated privileges. The flaw is categorized as a concurrency error (CWE‑362), a use‑after‑free (CWE‑415), and a buffer overrun (CWE‑416). If successfully exploited, the attacker could run arbitrary code with higher system privileges, potentially compromising the entire operating system.

Affected Systems

Microsoft Windows 10 versions 1809, 21H2, and 22H2; Windows 11 versions 23H2, 24H2, 25H2, and 22H3; Windows Server 2019 (including Server Core), Windows Server 2022, Windows Server 2025, and the 23H2 Server Edition (including Server Core). All x86, x64, and ARM64 builds listed in the affected CPEs are impacted.

Risk and Exploitability

The CVSS base score is 7.8, indicating high severity. The EPSS score is below 1%, implying a low likelihood of widespread exploitation at present, and the vulnerability is not listed in the CISA KEV catalog. The likely attack vector is local; an attacker needs authenticated access to the machine or the Windows Management Services interface. Once authenticated, the race condition can be triggered, allowing privilege escalation. The combination of a high CVSS score and a low EPSS probability suggests a moderate to high risk level for systems where local users may have administrative or elevated permissions.

Generated by OpenCVE AI on April 16, 2026 at 08:10 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the Microsoft security update for CVE‑2026‑20861 as described in the Microsoft Update guidance.
  • Limit the number of local accounts that can access Windows Management Services and enforce least‑privilege principles on all remaining accounts.
  • Configure audit policy to log privilege‑escalation events and review logs for suspicious activity to detect potential exploitation attempts.

Generated by OpenCVE AI on April 16, 2026 at 08:10 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 15 Jan 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows Server 2022 23h2
CPEs cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
Vendors & Products Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows Server 2022 23h2

Tue, 13 Jan 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 13 Jan 2026 18:15:00 +0000

Type Values Removed Values Added
Description Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Title Windows Management Services Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Microsoft windows Server 23h2
Weaknesses CWE-362
CWE-415
CWE-416
CPEs cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_23h2:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Microsoft windows Server 23h2
References
Metrics cvssV3_1

{'score': 7.8, 'vector': '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'}


Subscriptions

Microsoft Windows 10 1809 Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 Windows 10 22h2 Windows 11 23h2 Windows 11 23h2 Windows 11 24h2 Windows 11 24h2 Windows 11 25h2 Windows 11 25h2 Windows Server 2019 Windows Server 2022 Windows Server 2022 23h2 Windows Server 2025 Windows Server 23h2
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-04-01T13:49:06.535Z

Reserved: 2025-12-03T05:54:20.380Z

Link: CVE-2026-20861

cve-icon Vulnrichment

Updated: 2026-01-13T20:18:23.437Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-13T18:16:15.137

Modified: 2026-01-15T15:31:53.790

Link: CVE-2026-20861

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-16T08:15:29Z

Weaknesses