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Critical Windows Netlogon RCE flaw now exploited in attacks

Summary by BleepingComputer
The Centre for Cybersecurity Belgium (CCB), the country's national authority for cybersecurity, warned on Friday that threat actors are now exploiting a recently patched critical Windows Netlogon vulnerability in attacks.
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In the big May patch package, the vulnerability in Windows Netlogon had been fixed, now attackers are using it. Admins should patch urgently.

·Germany
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A critical vulnerability in Windows servers is already being exploited: attackers can use malicious code without logging in. IT admins should act now and install available updates immediately. (Continue reading)

A critical failure in Windows Netlogon is being actively explored by invaders, leading security authorities and IT teams around the world to reinforce alerts for immediate updating of affected systems. Vulnerability, identified as CVE-2026-41089, received CVSS 9.8 score, considered critical, due to the potential to allow remote code execution without authentication on Windows servers. The alert gained even more relevance after the Belgian Cybers…

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BleepingComputer broke the news in New York, United States on Monday, June 1, 2026.
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