CVE-2026-27907
Published: 14 April 2026
Summary
CVE-2026-27907 is a high-severity Wrap or Wraparound (CWE-191) vulnerability in Microsoft Windows 11 23H2. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 20.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly mitigates the integer underflow vulnerability by requiring timely application of Microsoft patches for the Windows Storage Spaces Controller flaw.
Implements memory protections such as ASLR and DEP that thwart exploitation of integer underflow leading to memory corruption and privilege escalation.
Enforces least privilege for local accounts, limiting the scope and impact of low-privileged attackers attempting to exploit the vulnerability for escalation.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Integer underflow in Windows kernel-mode Storage Spaces component directly enables local privilege escalation from low-privileged context (T1068).
NVD Description
Integer underflow (wrap or wraparound) in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.
Deeper analysisAI
CVE-2026-27907, published on 2026-04-14, is an integer underflow vulnerability (CWE-191) in the Windows Storage Spaces Controller. This flaw enables an authorized attacker to elevate privileges locally and carries a CVSS v3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high impact on confidentiality, integrity, and availability.
A local attacker with low privileges (PR:L) can exploit the vulnerability with low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation allows privilege escalation, providing the attacker with unauthorized high-level access that compromises system confidentiality, integrity, and availability without changing scope.
For details on mitigations, patches, and remediation steps, security practitioners should consult the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27907.
Details
- CWE(s)