CVE-2026-70297

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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 execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-14

AI Q&A

2026-10-14

EPSS Evaluated

N/A

NVD

CVE-2026-70297

EUVD

EUVD-2026-100138

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 execute arbitrary code over a network by manipulating file paths.

Impact Analysis

An attacker could exploit this to run malicious code on affected systems, potentially leading to data breaches, unauthorized access, or system compromise. Users of Skype for Business or Lync are at risk if the software is not patched.

Compliance Impact

This vulnerability could lead to unauthorized access or data exfiltration, violating GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations must address it to maintain compliance.

Mitigation Strategies

Apply the latest cumulative updates for Microsoft Skype for Business Server 2015 CU13, 2019 CU8, or Subscription Edition CU1 as they address the path traversal issue.

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