Path Traversal in Windows Telephony Service Enables Privilege Escalation

Publication date: 2026-01-13

Last updated on: 2026-05-26

Assigner: Microsoft Corporation

Description

External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.

CVSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-05-26

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-20931

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_telephony_service	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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 a file name or path in the Windows Telephony Service, which allows an authorized attacker to elevate their privileges over an adjacent network. [1]

Impact Analysis

An attacker who is authorized and has access to an adjacent network can exploit this vulnerability to elevate their privileges, potentially gaining higher-level access and control over the affected system. [1]

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