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.
Skype for Business 中客户端身份验证机制的使用，使得经过授权的攻击者能够在网络层面上实施欺骗攻击。
Affected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
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
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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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-2026-78510 | 9.8 CRITICAL | Microsoft Word Remote Code Execution Vulnerability |
| CVE-2026-69463 | 9.8 CRITICAL | Windows NTFS Remote Code Execution Vulnerability |
| CVE-2026-69496 | 9.8 CRITICAL | Windows Compressed Folder Remote Code Execution Vulnerability |
Showing top 20 of 966 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Skype for Business Server 2015 CU13
-
CVE-2026-66303
Skype for Business and Lync Denial of Service Vulnerability -
CVE-2026-66307
Skype for Business and Lync Denial of Service Vulnerability -
CVE-2026-69646
Skype for Business Spoofing Vulnerability -
CVE-2026-69642
Skype for Business Spoofing Vulnerability -
CVE-2026-63523
Skype for Business Spoofing Vulnerability
Same vendor: Microsoft
-
CVE-2026-66307
Skype for Business and Lync Denial of Service Vulnerability -
CVE-2026-66303
Skype for Business and Lync Denial of Service Vulnerability -
CVE-2026-69646
Skype for Business Spoofing Vulnerability -
CVE-2026-69642
Skype for Business Spoofing Vulnerability -
CVE-2026-63523
Skype for Business Spoofing Vulnerability
Same weakness: CWE-603
-
CVE-2026-76945
Ebyte NE2-D11 Use of Client-Side Authentication -
CVE-2026-71187
Ebyte NA111-M Use of Client-Side Authentication -
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Authorization Bypass in Sparx Enterprise Architect -
CVE-2026-8830
Keycloak: org.keycloak/keycloak-services: keycloak: policy b -
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V. Comments for CVE-2026-66305
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