CVE-2026-20869

High · 7.0

CVSS

7.0

EPSS

0.3%

Published

Jan 13, 2026

CISA due date

—

The record

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Local Session Manager (LSM) allows an authorized attacker to elevate privileges locally.

Affected packages

Ecosystem	Package	Introduced	Fixed