CVE-2026-20877 | Severity.io

Description

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

Related CPE's

o

microsoft

windows_10_1809

2

windows_10_21h2

Vulnerable

windows_10_22h2

Vulnerable

windows_11_23h2

Vulnerable

windows_11_24h2

Vulnerable

windows_11_25h2

Vulnerable

windows_server_2019

Vulnerable

windows_server_2022

Vulnerable

windows_server_2022_23h2

Vulnerable

windows_server_2025

Vulnerable

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20877

Vendor Advisory

Weaknesses

[email protected]

Primary

CWE-362CWE-416

CVSS impact metrics

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

7.8 · High

Information

Source identifier

[email protected]

Vulnerability status

Analyzed

Published

2026-01-13T18:16:17.813Z

2 days ago

Last modified

2026-01-15T21:25:29.823Z

2 hours ago