CVE-2026-26181

Received Received - Intake

Use-After-Free in Microsoft Brokering File System Elevates Privileges

Publication date: 2026-04-14

Last updated on: 2026-04-23

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-04-14

Last Modified

2026-04-23

Generated

2026-07-06

AI Q&A

2026-04-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-26181

EUVD

EUVD-2026-22424

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_23h2	to 10.0.22631.6936 (exc)
microsoft	windows_11_23h2	to 10.0.22631.6936 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8246 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8246 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8246 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8246 (exc)
microsoft	windows_11_26h1	to 10.0.28000.1836 (exc)
microsoft	windows_11_26h1	to 10.0.28000.1836 (exc)
microsoft	windows_server_2022_23h2	to 10.0.25398.2274 (exc)
microsoft	windows_server_2025	to 10.0.26100.32690 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-362	The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This vulnerability is a use-after-free issue in the Microsoft Brokering File System. It allows an authorized attacker to elevate their privileges locally on the affected system.

Impact Analysis

An attacker who exploits this vulnerability can gain higher privileges on the local system than they are normally authorized to have. This elevation of privilege can lead to full control over the affected system, potentially allowing the attacker to execute arbitrary code, access sensitive data, or disrupt system operations.

Compliance Impact

The vulnerability allows an authorized attacker to elevate privileges locally through a use after free in Microsoft Brokering File System.

Such elevation of privilege vulnerabilities can potentially impact compliance with standards like GDPR and HIPAA by increasing the risk of unauthorized access to sensitive data.

However, no specific information about direct effects on compliance with these regulations is provided in the available resources.

Mitigation Strategies

To mitigate this vulnerability, apply the security updates provided by Microsoft as soon as possible to address the use after free issue in the Microsoft Brokering File System.

Since the vulnerability allows local privilege escalation, ensure that only trusted users have local access to affected systems and monitor for unusual privilege escalation attempts.

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