CVE-2026-83746: Skype for Business Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 8.1)

CVSS Vector

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

Category

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Oct

Released

2026-10-13

Description

Absolute path traversal in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.

FAQ

What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker would be able to delete targeted files on a system.

Affected Products (3)

Microsoft Office

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

Security Updates (1)

• 5131692

Acknowledgments

P1hcn

Revision History

• 2026-10-13: Information published.