CVE-2026-20931
8
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Summary
External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 < 10.0.14393.8783 | affected |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 < 10.0.17763.8276 | affected |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 < 10.0.19044.6809 | affected |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 < 10.0.19045.6809 | affected |
| Microsoft | Windows 11 version 22H3 | 10.0.22631.0 < 10.0.22631.6491 | affected |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 < 10.0.22631.6491 | affected |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 < 10.0.26100.7623 | affected |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 < 10.0.26200.7623 | affected |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | 6.1.7601.0 < 6.1.7601.28117 | affected |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | 6.1.7601.0 < 6.1.7601.28117 | affected |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.6003.0 < 6.0.6003.23717 | affected |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | 6.0.6003.0 < 6.0.6003.23717 | affected |
| Microsoft | Windows Server 2012 | 6.2.9200.0 < 6.2.9200.25868 | affected |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 < 6.2.9200.25868 | affected |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 < 6.3.9600.22968 | affected |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 < 6.3.9600.22968 | affected |
| Microsoft | Windows Server 2016 | 10.0.14393.0 < 10.0.14393.8783 | affected |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 < 10.0.14393.8783 | affected |
| Microsoft | Windows Server 2019 | 10.0.17763.0 < 10.0.17763.8276 | affected |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 < 10.0.17763.8276 | affected |
| Microsoft | Windows Server 2022 | 10.0.20348.0 < 10.0.20348.4648 | affected |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 < 10.0.25398.2092 | affected |
| Microsoft | Windows Server 2025 | 10.0.26100.0 < 10.0.26100.32230 | affected |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 < 10.0.26100.32230 | affected |
Weaknesses
- CWE-73: CWE-73: External Control of File Name or Path
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
CVE Program Container
Additional References
- 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
References
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