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Review reviewHigh

CVE-2026-44809

Microsoft Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1

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

CVSS
7.8
EPSS
0.27%
18.7% percentile
CISA KEV
Not listed
Published
2026.06.10
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.27%
Technical severityCVSS 7.8

Vulnerability overview

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

Affected product and versions

Product
Microsoft Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1
Affected versions
>= 10.0.26100.0 < 10.0.26100.8655, >= 10.0.26200.0 < 10.0.26200.8655, >= 10.0.28000.0 < 10.0.28000.2269, >= 10.0.26100.0 < 10.0.26100.32995, < 10.0.26100.8655, < 10.0.26200.8655, < 10.0.28000.2269, < 10.0.26100.32995
Fixed versions
10.0.26100.8655, 10.0.26200.8655, 10.0.28000.2269, 10.0.26100.32995

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Microsoft Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2026-44809 — Microsoft Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1 | SECUFOCUS NOW