CVE-2026-69646

Skype for Business Spoofing Vulnerability

State: Published
Severity: 8.3 High
Published: Sep 8, 2026
Updated: Oct 31, 2026
Reserved: Aug 3, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	8.3 High	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	microsoft

Weaknesses

CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
Skype for Business Server 2015 CU13Microsoft	9319.0 to before 6.0.9319.885Affected
Skype for Business Server 2019 CU8Microsoft	2046.0 to before 7.0.2046.569Affected
Skype for Business Server Subscription Edition CU1Microsoft	2046.0 to before 7.0.2046.879Affected

References

Skype for Business Spoofing Vulnerabilityvendor-advisorypatch

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