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CVE-2026-20931

Windows Telephony Service Elevation of Privilege Vulnerability

Published: Jan 13, 2026Updated: May 26, 2026 Sources: CVE List NVD BDUCWE-73
NVD MITRE
8.0CVSSHIGH
EPSS Score
0.8%
Top 49.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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

CVSS Vector Breakdown

AV:AAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-73

Affected Products

Windows Server 2025Microsoft Corp
On-premOS
Operating Systems / windows
Windows 11 24H2Microsoft Corp
On-premOS
Operating Systems / windows
Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft Corp
On-premOS
Operating Systems / windows
Windows 11 23H2Microsoft Corp
On-premOS
Operating Systems / windows
Windows 11 25H2Microsoft Corp
On-premOS
Operating Systems / windows
microsoft corpcommercialUSOperating Systemsaka microsoft corporation
and 57 more affected products View all →

Exploitability

Official Patch Available

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20931
msrc.microsoft.com
https://www.vicarius.io/vsociety/posts/cve-2026-20931-detection-script-elevation-of-privilege-vulnerability-in-windows-telephony-service
vicarius.io
https://www.vicarius.io/vsociety/posts/cve-2026-20931-mitigation-script-elevation-of-privilege-vulnerability-in-windows-telephony-service
vicarius.io

Timeline

Published
Jan 13, 2026
Last Updated
May 26, 2026

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