---
id: CVE-2026-85873
title: >-
  Improper authorization in Skype for Business and Microsoft Lync allows an
  authorized attacker to elevate privileges over a network.
summary: >-
  Improper authorization in Skype for Business and Microsoft Lync allows an
  authorized attacker to elevate privileges over a network.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-639
vendor: Microsoft
product: Skype for Business Server 2015 CU13
affected:
  - skype_for_business_server_2015_cu13 >= 9319.0 < 6.0.9319.886
  - skype_for_business_server_2019_cu8 >= 2046.0 < 7.0.2046.583
  - skype_for_business_server_subscription_edition_cu1 >= 2046.0 < 7.0.2046.889
  - skype_for_business_server_subscription_edition_rtm >= 1.0.0 < 7.0.2046.889
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T14:18:44.720'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85873'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85873'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00957
epssPercentile: 0.61289
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-13T20:05:34.709616Z'
ingestedAt: '2026-10-13T19:43:29.187Z'
---

## Overview

Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.