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CVE-2026-66305— Skype for Business Spoofing Vulnerability

Quick assessment

Affected
Microsoft Skype for Business Server 2015 CU13
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Skype for Business Server是美国Microsoft公司的一款企业级即时通讯与协作服务器软件。 Microsoft Skype for Business Server 2015 CU13 6.0.9319.885之前版本、Skype for Business Server 2019 CU8 7.0.2046.569之前版本和Skype for Business Server Subscription Edition CU1 7.0.2046.879之前版本存在授权

CVSS 7.1 · High EPSS 0.53% · P44

Affected Version Matrix 3

VendorProduct Version RangeStatus
Microsoft Skype for Business Server 2015 CU13 9319.0< 6.0.9319.885 affected
Microsoft Skype for Business Server 2019 CU8 2046.0< 7.0.2046.569 affected
Microsoft Skype for Business Server Subscription Edition CU1 2046.0< 7.0.2046.879 affected
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I. Basic Information for CVE-2026-66305

Vulnerability Information
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Vulnerability Title
Skype for Business Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用客户端的认证机制
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Skype for Business Server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Skype for Business Server是美国Microsoft公司的一款企业级即时通讯与协作服务器软件。 Microsoft Skype for Business Server 2015 CU13 6.0.9319.885之前版本、Skype for Business Server 2019 CU8 7.0.2046.569之前版本和Skype for Business Server Subscription Edition CU1 7.0.2046.879之前版本存在授权
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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 -

II. Public POCs for CVE-2026-66305

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III. Intelligence Information for CVE-2026-66305

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Vendor Advisories for CVE-2026-66305 (1)

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

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CVE-2026-69525 9.8 CRITICAL Remote Desktop Services Remote Code Execution Vulnerability
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Showing top 20 of 966 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Skype for Business Server 2015 CU13
Same vendor: Microsoft
Same weakness: CWE-603

V. Comments for CVE-2026-66305

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