CVE-2026-27907

Windows Storage Spaces Controller Elevation of Privilege Vulnerability

State: Published
Severity: 7.8 High
Published: Apr 14, 2026
Updated: Oct 15, 2026
Reserved: Feb 24, 2026

Description

Integer underflow (wrap or wraparound) in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-191 Integer Underflow (Wrap or Wraparound)

Affected Products

Product	Versions
Windows 11 version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.6936Affected
Windows 11 Version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.6936Affected
Windows 11 Version 24H2Microsoft	10.0.26100.0 to before 10.0.26100.8246Affected
Windows 11 Version 25H2Microsoft	10.0.26200.0 to before 10.0.26200.8246Affected
Windows 11 version 26H1Microsoft	10.0.28000.0 to before 10.0.28000.1836Affected
Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft	10.0.25398.0 to before 10.0.25398.2274Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.32690Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.32690Affected

References

Windows Storage Spaces Controller Elevation of Privilege Vulnerabilityvendor-advisorypatch

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