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highWindowssecurity advisorym365_message_center · Oct 28, 2026
Microsoft Windows: Updates to address compromised eMudhra certificate authority keys
Microsoft is addressing a security issue involving compromised eMudhra certificate authority keys, which could be used to create fraudulent certificates or sign malicious content. This update is critical to prevent potential security threats and maintain trust in digital communications.
“Services: Microsoft 365 suite. <p><b>[What and why]</b></p><p>Microsoft is responding to an issue involving eight eMudhra intermediate certificate authority (CA) private keys, six associated with TLS and two with code signing. Because these keys could be recovered, they could potentially be used to create certificate…”
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threat_protectionendpoint_securityidentity_security
Audience
adminsecurity_engineerend_user
Environment
on_premisescloud
Ontology Topics
MD-102AZ-500
Classification confidence: 95%
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