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CVE-2026-66302

CriticalCVSS 9.8/10Last modified Nov 10, 2026

Description

External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Skype for Business Server 2015 CU13	>= 9319.0, < 6.0.9319.885
Microsoft	Skype for Business Server 2019 CU8	>= 2046.0, < 7.0.2046.879
Microsoft	Skype for Business Server Subscription Edition CU1	>= 2046.0, < 7.0.2046.569

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66302Patch, Vendor Advisory

Timeline

Published: Sep 8, 2026
Last modified: Nov 10, 2026
NVD status: Analyzed

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