CVE-2026-83746

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Path Traversal in Skype for Business and Microsoft Lync

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83746

EUVD

EUVD-2026-100141

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Skype	for Business Server 2015 CU13 9319.0
Microsoft	Skype	for Business Server 2019 CU8 2046.0
Microsoft	Skype	for Business Server Subscription Edition CU1 2046.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-36	The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as "/abs/path" that can resolve to a location that is outside of that directory.

Attack-Flow Graph

Executive Summary

This vulnerability is an absolute path traversal flaw in Skype for Business and Microsoft Lync. It allows an authorized attacker to elevate their privileges over a network by exploiting improper path handling.

Impact Analysis

An attacker could gain higher privileges than intended, potentially accessing sensitive data or performing unauthorized actions on affected systems.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating compliance requirements for data protection and privacy regulations like GDPR and HIPAA.

Mitigation Strategies

Apply the latest security updates from Microsoft for Skype for Business Server 2015 CU13, 2019 CU8, and Subscription Edition CU1 as soon as possible to address the absolute path traversal vulnerability.

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