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CVE-2026-66307

HighCVSS 7.5/10Last modified Sep 16, 2026

Description

Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Skype for Business Server 2015 CU13	>= 9319.0, < 6.0.9319.885
Microsoft	Skype for Business Server 2019 CU8	>= 2046.0, < 7.0.2046.569
Microsoft	Skype for Business Server Subscription Edition CU1	>= 2046.0, < 7.0.2046.879

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66307Patch, Vendor Advisory

Timeline

Published: Sep 8, 2026
Last modified: Sep 16, 2026
NVD status: Analyzed

Related CVEs from 2026

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CVE-2026-66307: High severity, CVSS 7.5 | Vulnix