VulnerabilityModified
CVE-2026-20931
External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.
HIGH 8.0EPSS 0.86%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.86%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.
- CVSS 3.1
- 8.0 HIGHCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.86% probability · 56th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-73
- Affected
- microsoft/windows 10 1607 · microsoft/windows 10 1809 · microsoft/windows 10 21h2 · microsoft/windows 10 22h2 · microsoft/windows 11 23h2 · microsoft/windows 11 24h2 · microsoft/windows 11 25h2 · microsoft/windows server 2008 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019 · microsoft/windows server 2022 · microsoft/windows server 2022 23h2 · microsoft/windows server 2025
- Source
- secure@microsoft.com
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20931Vendor Advisory
- https://www.vicarius.io/vsociety/posts/cve-2026-20931-detection-script-elevation-of-privilege-vulnerability-in-windows-telephony-service
- https://www.vicarius.io/vsociety/posts/cve-2026-20931-mitigation-script-elevation-of-privilege-vulnerability-in-windows-telephony-service
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.