CVE-2026-69646

Published: Sep 8, 2026Modified: Sep 16, 2026

8.3

Vector

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

Exploitability: 2.8 / Impact: 5.5

Source: secure@microsoft.com (Secondary)

Description

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

Products: Microsoft: Skype For Business Server, Skype For Business Server Subscription Edition

2 products

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Microsoft Skype For Business Server	Version 2015 cumulative_update_13
Microsoft Skype For Business Server	Version 2015 cumulative_update_13_hotfix_2

Configuration B

3 vulnerable

Vulnerable Software	Affected Versions
Microsoft Skype For Business Server	Version 2019 cumulative_update_8
Microsoft Skype For Business Server	Version 2019 cumulative_update_8_hotfix1
Microsoft Skype For Business Server	Version 2019 cumulative_update_8_hotfix2

Configuration C

1 vulnerable

Vulnerable Software	Affected Versions
Microsoft Skype For Business Server Subscription Edition	Version 7.0.2046.849

Source: secure@microsoft.com

PatchVendor Advisory

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