CVE-2026-50402

Analyzed Analyzed - Analysis Complete

Incorrect Numeric Conversion in Windows NTFS Elevates Privileges

Publication date: 2026-07-14

Last updated on: 2026-07-22

Assigner: Microsoft Corporation

Description

Incorrect conversion between numeric types in Windows NTFS allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-14

Last Modified

2026-07-22

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-50402

EUVD

EUVD-2026-44049

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_11_26h1	to 10.0.28000.2269 (exc)
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1607	to 10.0.14393.9339 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_10_1809	to 10.0.17763.9020 (exc)
microsoft	windows_server_2016	to 10.0.14393.9339 (exc)
microsoft	windows_server_2019	to 10.0.17763.9020 (exc)
microsoft	windows_server_2022	to 10.0.20348.5386 (exc)
microsoft	windows_server_2025	to 10.0.26100.33158 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2525 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8875 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8875 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-126	The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.
CWE-681	When converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. If the resulting values are used in a sensitive context, then dangerous behaviors may occur.

Attack-Flow Graph

Executive Summary

This vulnerability involves an incorrect conversion between numeric types in Windows NTFS. An authorized attacker can exploit this flaw to elevate their privileges locally on a system.

Detection Guidance

This vulnerability involves incorrect numeric type conversion in Windows NTFS. Detection requires checking for unauthorized privilege escalation attempts or unusual NTFS operations. Monitor system logs for suspicious activity related to privilege changes or NTFS driver errors. Use Windows Event Viewer to review Security logs for events like 4624 (successful logons) and 4672 (special privileges assigned). Check for unexpected modifications to critical system files or registry keys.

Impact Analysis

An attacker could gain higher-level access to your system, allowing them to perform unauthorized actions such as installing malicious software, accessing sensitive data, or taking control of your device.

Compliance Impact

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

Mitigation Strategies

Apply the latest Windows security updates from Microsoft to patch the NTFS numeric type conversion flaw. Monitor Microsoft's update guide for CVE-2026-50402 for specific patch details.

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