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

highCVSS 7.8CVE-2026-44809
Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Common Log File System DriverPrivilege escalation
What
A use-after-free vulnerability allows an authorized attacker to elevate privileges locally.
Who is affected
Authorized users of Windows systems with the Common Log File System Driver.
Urgency
Remediation is high urgency due to the potential for local privilege escalation.
Action
Apply the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44809

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-44809coverage & exploitation statusNVD · CVE.org

Recent advisories for Windows Common Log

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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