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CVE-2026-66305 Details

Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

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URL	Source(s)	Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66305	[email protected]	PatchVendor Advisory

CWE-ID	CWE Name	Source
CWE-603	Use of Client-Side Authentication	[email protected]

Product	Versions
microsoft skype for business server	2015 cumulative_update_13 2015 cumulative_update_13_hotfix_2 2019 cumulative_update_8 2019 cumulative_update_8_hotfix1 2019 cumulative_update_8_hotfix2
CPE cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:::::: cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13_hotfix_2:::::: cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8:::::: cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix1:::::: cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix2:::::: Remediation No remediation found in references.
microsoft skype for business server subscription edition	7.0.2046.849
CPE cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:7.0.2046.849:::::::* Remediation No remediation found in references.

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