CVE-2026-85873

Skype for Business Elevation of Privilege Vulnerability

State: Published
Severity: 6.5 Medium
Published: Oct 13, 2026
Updated: Oct 31, 2026
Reserved: Sep 4, 2026

Description

Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
Skype for Business Server 2015 CU13Microsoft	9319.0 to before 6.0.9319.886Affected
Skype for Business Server 2019 CU8Microsoft	2046.0 to before 7.0.2046.583Affected
Skype for Business Server Subscription Edition CU1Microsoft	2046.0 to before 7.0.2046.889Affected

References

Skype for Business Elevation of Privilege Vulnerabilityvendor-advisorypatch

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