PT-2026-2734 · Microsoft · Windows Telephony Service +1

Sergey Bliznyuk · Published 2026-01-13 · Updated 2026-01-13 · CVE-2026-20931

Positive Technologies · (AI Summary)

CVSS v3.1

8.0

8.0

High

Base vector

AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Telephony Service (affected versions not specified)

Description An issue exists in the Windows Telephony Service where external control of a file name or path can allow an authorized attacker to elevate privileges over an adjacent network.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-73

Related Identifiers

CVE-2026-20931

Affected Products

Windows

Windows Telephony Service

References · 6

• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-20931 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20931 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20931 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20931 · Security Note
• https://twitter.com/CVEnew/status/2011181507977887837 · Twitter Post
• https://twitter.com/leonov_av/status/2011182019628167593 · Twitter Post