CVE-2026-66305

Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.

Score

CVSS 3.1 7.1 High

Status

Analyzed - secure@microsoft.com

Published

2026-09-08

Last modified

2026-10-14

Weaknesses

CWE-603

Affected products

• Skype For Business Server (Microsoft)
• Skype For Business Server 2015 (Microsoft)
• Skype For Business Server 2019 (Microsoft)
• Skype For Business Server Subscription Edition (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66305