06/01/2026
Security Bulletin: Windows Netlogon Remote Code Ex*****on — Microsoft Windows Netlogon (CVE-2026-41089) contains a critical vulnerability that may allow unauthenticated attackers to execute arbitrary code remotely on vulnerable Windows Server systems. CVSS 9.8.
The flaw is caused by a stack-based buffer overflow in the Netlogon service and may lead to full compromise of authentication infrastructure and affected servers. Active exploitation in the wild has been reported by the Centre for Cybersecurity Belgium (CCB).
Organizations should immediately apply Microsoft May 2026 security updates, prioritize domain controllers and critical authentication systems, review Netlogon-related activity, and verify all Windows Server deployments are fully patched.
Windows Netlogon vulnerability (CVE-2026-41089) allows unauthenticated remote code ex*****on on Windows Server systems. Actively exploited. Patch immediately.