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Microsoft's Active Directory Tier Model separates administrative access by privilege level to prevent credential theft from cascading into full domain compromise. CVE-2026-41089's impact in poorly segmented environments makes the Tier Model the single highest-leverage post-incident investment. This guide covers the implementation sequence for organisations starting from scratch.
CVE-2026-41089 is the third significant Netlogon vulnerability with active exploitation in six years. Zerologon (CVE-2020-1472) prompted an industry-wide reckoning with domain controller exposure. If your DC network architecture has not materially changed since 2020, the reckoning was incomplete.
CipherWatch Editorial
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