Summary
Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An unauthenticated attacker could exploit this vulnerability over the network by sending a specially crafted request that writes an attacker-controlled file to an arbitrary location on the affected server. Successful exploitation could result in the attacker executing code on the target server. No authentication or user interaction is required.
Security updates
7.0.2046.879 — https://support.microsoft.com/help/5123287
7.0.2046.569 — https://support.microsoft.com/help/5123300
6.0.9319.885 — https://support.microsoft.com/help/5123301
Vulnerabilities 1
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Critical 9.8
Skype for Business Remote Code Execution Vulnerability
External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-66302 Skype for Business Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66302
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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