CVE-2026-66305

EUVD-2026-73937
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.1 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 43.77%
Affected Products (NVD)
VendorProductVersion
microsoftskype_for_business_server_subscription_edition
7.0.2046.849
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66305