CVE-2026-69646

Microsoft · Published September 8, 2026

8.3

CVSS v3.1

HIGH

Patch availableGet patch

Description

Skype for Business Spoofing Vulnerability. Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.

Affected Products

Skype for Business Server 2019 CU8
Skype for Business Server Subscription Edition CU1
Skype for Business Server 2015 CU13

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C