Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation More Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker could host a malicious server and convince a user to connect to it from an affected client. When the client processes the server's response, the attacker could execute code on the client system. User interaction is required.
Security updates
10.0.20348.5622 — https://support.microsoft.com/help/5122882
10.0.26100.33438 — https://support.microsoft.com/help/5122871
10.0.26200.9445 — https://support.microsoft.com/help/5124008
10.0.22631.7582 — https://support.microsoft.com/help/5122880
10.0.28000.2954 — https://support.microsoft.com/help/5124012
Vulnerabilities 1
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High 8.8
Windows Schannel Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Schannel 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-2026-72940 Windows Schannel Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72940
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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