CVE-2026-85873

Authenticated privilege escalation

Published Oct 13, 2026 · Updated Oct 13, 2026

Improper authorization in Microsoft Skype for Business Server allows remote authenticated users to elevate privileges over a network. The supplied record does not identify the affected authorization check, and an authoritative public advisory could not be retrieved for this CVE. Existing authorization is the reported gate; the resulting privilege level and affected operation remain unspecified.

CVSS severityUnavailable
Unscored
EPSS probability0.82%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Microsoft Skype for Business Server allows remote authenticated users to elevate privileges over a network. The supplied record does not identify the affected authorization check, and an authoritative public advisory could not be retrieved for this CVE. Existing authorization is the reported gate; the resulting privilege level and affected operation remain unspecified.

The record

CVE
CVE-2026-85873
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Microsoft Corporation
Product
Microsoft Skype for Business Server 2015
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

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=1.0.0 <7.0.2046.889; version=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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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