What is CVE-2026-83746?

CVE-2026-83746 is a high-severity vulnerability in Microsoft Skype For Business Server 2015 Cu13, classified under Absolute Path Traversal. CVSS score: 8.1/10. Published 2026-10-13.

How severe is CVE-2026-83746?

High severity. CVSS v3 base score is 8.1 out of 10.

Path Traversal in Microsoft Skype For Business Server 2015 Cu13

CVE-2026-83746

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

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-36 — Absolute Path Traversal

References

Skype for Business Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-83746?: CVE-2026-83746 is a high-severity vulnerability in Microsoft Skype For Business Server 2015 Cu13, classified under Absolute Path Traversal. CVSS score: 8.1/10. Published 2026-10-13.
How severe is CVE-2026-83746?: High severity. CVSS v3 base score is 8.1 out of 10.