CVE-2026-85873: Microsoft Skype For Business Server 2015 CU13

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft Skype For Business Server 2015 CU13: from 9319.0, before 6.0.9319.886 (fixed in 6.0.9319.886)
• Microsoft Skype For Business Server 2019 CU8: from 2046.0, before 7.0.2046.583 (fixed in 7.0.2046.583)
• Microsoft Skype For Business Server Subscription Edition CU1: from 2046.0, before 7.0.2046.889 (fixed in 7.0.2046.889)

Published 2026-10-13. Last modified 2026-10-16.