MEDIUM 6.5 Microsoft

CVE-2026-66303

Skype for Business and Lync Denial of Service Vulnerability

Microsoft Security Update 2026-Sep: Skype for Business and Lync Denial of Service Vulnerability

Affected Products

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66303
https://nvd.nist.gov/vuln/detail/CVE-2026-66303

Published: 2026-09-08 · Source: Microsoft · Feed updated: 2026-10-27

This medium severity vulnerability with a CVSS score of 6.5 was published on 2026-09-08 via Microsoft. Affected: Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU8, Skype for Business Server Subscription Edition CU1.

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