CVE-2026-83746 Skype for Business Elevation of Privilege Vulnerability
An authorized attacker can exploit absolute path traversal in Skype for Business Server to elevate privileges over the network.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83746?
CVE-2026-83746 is a high-severity path traversal vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Absolute path traversal in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-36
Which versions are affected by CVE-2026-83746?
How do I fix CVE-2026-83746?
No fix has been published for CVE-2026-83746 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-83746 being exploited?
There is no known exploitation of CVE-2026-83746 in the wild and no public exploit code.
Sources
Also known as GHSA-69h8-r8mw-xc99.