Absolute Path Traversal in Skype for Business Server and Skype for Business Server Subscription Edition - CVE-2026-83746
Published: October 14, 2026
Vulnerability identifier: #VU154957
CSH Severity: Medium
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-83746
CWE-ID: CWE-36
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to escalate privileges and delete targeted files on a system.
The vulnerability exists due to absolute path traversal in Skype for Business and Microsoft Lync when handling file paths over a network. A remote user can exploit the path traversal to escalate privileges and delete targeted files on a system.
Affected software
Skype for Business Server
Skype for Business Server Subscription Edition
Skype for Business Server Subscription Edition
How to mitigate CVE-2026-83746
Install security update from vendor's website.
Skype for Business Server - addressed in versions 6.0.9319.886, 7.0.2046.583
Skype for Business Server Subscription Edition - update to 7.0.2046.889
Skype for Business Server Subscription Edition - update to 7.0.2046.889