Summary
Impact: Spoofing. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker with access to the internal network and a certificate trusted by the deployment could exploit this vulnerability by impersonating a trusted Skype for Business server. Successful exploitation could allow the attacker to act as another user or administrator without Skype credentials or user interaction.
Security updates
7.0.2046.569 — https://support.microsoft.com/help/5123300
7.0.2046.879 — https://support.microsoft.com/help/5123287
6.0.9319.885 — https://support.microsoft.com/help/5123301
Vulnerabilities 1
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High 8.3
Skype for Business Spoofing Vulnerability
Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.
Revision history
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#1
Information published.
References
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CVE-2026-69646 Skype for Business Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69646
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss