What is CVE-2026-85873?

CVE-2026-85873 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Skype for Business Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-85873 cover?

CVE-2026-85873 covers the following CVE IDs: CVE-2026-85873. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-85873?

CVE-2026-85873 has a CVSS v3 base score of 6.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-85873?

CVE-2026-85873 affects 4 products, including: Skype for Business Server 2015 CU13; Skype for Business Server 2019 CU8; Skype for Business Server Subscription Edition CU1; Skype for Business Server Subscription Edition RTM.

CVE-2026-85873HighCVSS 6.5

Skype for Business Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

October 13, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-85873 →

📋 Description

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

🎯 Affected products4

Skype for Business Server 2015 CU13
Skype for Business Server 2019 CU8
Skype for Business Server Subscription Edition CU1
Skype for Business Server Subscription Edition RTM

✅ Remediation

KB5131692 (Security Update) — fixed build 7.0.2046.889 KB5131693 (Security Update) — fixed build 7.0.2046.583 KB5132779 (Security Update) — fixed build 6.0.9319.886 KBRelease Notes (Security Update) — fixed build 7.0.2046.889

🔗 References (5)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85873
patchhttps://www.microsoft.com/en-us/download/details.aspx?id=108874
referencehttps://support.microsoft.com/help/5131692
referencehttps://support.microsoft.com/help/5131693
referencehttps://support.microsoft.com/help/5132779