CVE-2026-88074

Analyzed Analyzed - Analysis Complete

Integer Overflow in Windows VBS Enclave Leads to Privilege Escalation

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Integer overflow or wraparound in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-88074

EUVD

EUVD-2026-99649

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer overflow or wraparound flaw in the Windows Virtualization-Based Security (VBS) Enclave. It allows an authorized attacker with local access to elevate their privileges on the system.

Detection Guidance

Detection requires checking for the presence of the security update addressing CVE-2026-88074. Use Windows Update or run 'wmic qfe list' to verify if the patch is installed. Monitor system logs for unusual privilege elevation events.

Impact Analysis

An attacker could exploit this to gain higher-level permissions on your system, potentially allowing them to install programs, view or delete data, or create new accounts with full user rights.

Compliance Impact

This vulnerability allows local privilege escalation in Windows VBS Enclave, which could enable unauthorized access to sensitive data or system functions. Such breaches may violate compliance requirements under GDPR (data protection) and HIPAA (health information security) by exposing protected data or failing integrity controls.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Virtualization-Based Security (VBS) Enclave vulnerability. Monitor Microsoft's update guide for patches and install them promptly.

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