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CVE-2026-21253

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CVE-2026-21253

Published: Feb 10, 2026

Modified: May 11, 2026

PUBLISHED

CVSS v3.1

7.0

HIGH

Description

Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally.

VendorProductVersions

Microsoft

Windows 10 Version 1607

affected
10.0.14393.0 - < 10.0.14393.8868

Microsoft

Windows 10 Version 1809

affected
10.0.17763.0 - < 10.0.17763.8389

Microsoft

Windows 10 Version 21H2

affected
10.0.19044.0 - < 10.0.19044.6937

Microsoft

Windows 10 Version 22H2

affected
10.0.19045.0 - < 10.0.19045.6937

Microsoft

Windows 11 version 22H3

affected
10.0.22631.0 - < 10.0.22631.6649

Microsoft

Windows 11 Version 23H2

affected
10.0.22631.0 - < 10.0.22631.6649

Microsoft

Windows 11 Version 24H2

affected
10.0.26100.0 - < 10.0.26100.7840

Microsoft

Windows 11 Version 25H2

affected
10.0.26200.0 - < 10.0.26200.7840

Microsoft

Windows 11 version 26H1

affected
10.0.28000.0 - < 10.0.28000.1575

Microsoft

Windows 11 Version 26H1

affected
10.0.28000.0 - < 10.0.28000.1575

Microsoft

Windows Server 2012

affected
6.2.9200.0 - < 6.2.9200.25923

Microsoft

Windows Server 2012 (Server Core installation)

affected
6.2.9200.0 - < 6.2.9200.25923

Microsoft

Windows Server 2012 R2

affected
6.3.9600.0 - < 6.3.9600.23022

Microsoft

Windows Server 2012 R2 (Server Core installation)

affected
6.3.9600.0 - < 6.3.9600.23022

Microsoft

Windows Server 2016

affected
10.0.14393.0 - < 10.0.14393.8868

Microsoft

Windows Server 2016 (Server Core installation)

affected
10.0.14393.0 - < 10.0.14393.8868

Microsoft

Windows Server 2019

affected
10.0.17763.0 - < 10.0.17763.8389

Microsoft

Windows Server 2019 (Server Core installation)

affected
10.0.17763.0 - < 10.0.17763.8389

Microsoft

Windows Server 2022

affected
10.0.20348.0 - < 10.0.20348.4773

Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)

affected
10.0.25398.0 - < 10.0.25398.2149

Microsoft

Windows Server 2025

affected
10.0.26100.0 - < 10.0.26100.32370

Microsoft

Windows Server 2025 (Server Core installation)

affected
10.0.26100.0 - < 10.0.26100.32370

Weaknesses (CWE)

CWE-416

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

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