MSRC-CVE-2026-44809 — Windows Common Log File System Driver Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.

Details

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Security updates
10.0.26100.32995 — https://support.microsoft.com/help/5094125
10.0.26200.8655 — https://support.microsoft.com/help/5094126
10.0.28000.2269 — https://support.microsoft.com/help/5095051

Vulnerabilities 1

High 7.8

CVE-2026-44809

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Microsoft Windows Server 2025 Windows Server 2025 (Server Core installation) Windows 11 Version 24H2 Windows

Jun 9, 2026

Revision history

2026-06-09 #1
Information published.

References

CVE-2026-44809 Windows Common Log File System Driver Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44809
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss