CVE-2026-63523— 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 在网页生成过程中未能妥善中和用户输入（跨站脚本，XSS），允许未经授权的攻击者通过网络执行欺骗攻击（spoofing）。
Possible ATT&CK Techniques 1 AI
T1565 · Data ManipulationAffected 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-2026-63523
Vulnerability Information
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Vulnerability Title
Skype for Business Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business allows an unauthorized attacker to perform spoofing over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
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-2026-63523
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-63523 (1)
Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total
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| CVE-2026-69769 | 9.8 CRITICAL | Windows HTTP Print Provider Remote Code Execution Vulnerability |
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| CVE-2026-73009 | 9.8 CRITICAL | Windows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability |
| CVE-2026-70296 | 9.8 CRITICAL | Windows Imaging Component Remote Code Execution Vulnerability |
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Showing top 20 of 966 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Skype for Business Server 2015 CU13
-
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
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CVE-2026-66305
Skype for Business Spoofing Vulnerability
Same vendor: Microsoft
-
CVE-2026-66307
Skype for Business and Lync Denial of Service Vulnerability -
CVE-2026-66303
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CVE-2026-69646
Skype for Business Spoofing Vulnerability -
CVE-2026-69642
Skype for Business Spoofing Vulnerability -
CVE-2026-66305
Skype for Business Spoofing Vulnerability
Same weakness: CWE-79
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