Summary
Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
Security updates
1.1.26100.4 — https://www.microsoft.com/en-us/wdsi/defenderupdates
Vulnerabilities 1
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High 8.8
Microsoft Defender Remote Code Execution Vulnerability
Null pointer dereference in Microsoft Defender 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-2026-122194 Microsoft Defender Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-122194
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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