External Control of File Name in .NET Elevates Privileges

Publication date: 2026-09-08

Last updated on: 2026-09-09

Assigner: Microsoft Corporation

Description

External control of file name or path in .NET allows an unauthorized attacker to elevate privileges over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-09

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-69805

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	net	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-522	The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.
CWE-73	The product allows user input to control or influence paths or file names that are used in filesystem operations.

Attack-Flow Graph

Executive Summary

This vulnerability involves external control of file names or paths in .NET. An unauthorized attacker can exploit it to elevate their privileges over a network, potentially gaining higher access rights than intended.

Impact Analysis

An attacker could exploit this to gain elevated privileges, allowing them to perform unauthorized actions such as accessing sensitive data, installing malware, or taking control of affected systems.

Mitigation Strategies

Apply the latest security updates from Microsoft for .NET to address the external control of file name or path vulnerability. Monitor Microsoft's update guide for patches and verify installation on all affected systems.

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