CVE-2026-83746Network attack vector

Authenticated privilege escalation via absolute path traversal

Published Oct 13, 2026 · Updated Oct 13, 2026

Path traversal in Microsoft Skype for Business Server allows remote authenticated users to elevate privileges over a network. Available evidence does not identify the affected component, the path-handling operation, or the privileges obtained. Exploitation requires authorized access; the record does not establish arbitrary code execution or a specific service-failure mode.

CVSS severityUnavailable
Unscored
EPSS probability1.01%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Microsoft Skype for Business Server allows remote authenticated users to elevate privileges over a network. Available evidence does not identify the affected component, the path-handling operation, or the privileges obtained. Exploitation requires authorized access; the record does not establish arbitrary code execution or a specific service-failure mode.

The record

CVE
CVE-2026-83746
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Microsoft Corporation
Product
Microsoft Skype for Business Server 2015
Classifications
CWE-36, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9319.0 <6.0.9319.886

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft Corporation · Microsoft Skype for Business Server 2015version=9319.0 <6.0.9319.886
Microsoft Corporation · Microsoft Skype for Business Server 2019version=2046.0 <7.0.2046.583
Microsoft Corporation · Skype for Business Server Subscription Editionversion=2046.0 <7.0.2046.889

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-36Absolute Path Traversal
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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