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2026-007: Critical Vulnerability in Windows Netlogon

criticalCVE-2026-41089
On 12 May 2026, Microsoft published a security advisory addressing a critical vulnerability affecting Windows Server when acting as a domain controller. This vulnerability allows an unauthenticated attacker to execute arbitrary code over a network. According to The Centre for Cybersecurity Belgium (CCB), this vulnerability is currently exploited by threat actors. It is strongly recommended updating affected Windows servers as soon as possible.

CSIRTS triage

vendor: Microsoftproduct: Windows ServerRemote code execution
What
A critical vulnerability allows unauthenticated attackers to execute arbitrary code over a network.
Who is affected
Windows Server acting as a domain controller is affected.
Urgency
Remediation is urgent as the vulnerability is currently exploited by threat actors.
Action
Update affected Windows servers immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CERT-EU Security Advisories (EU · eu · site)
Severity
critical
Published
2026-06-10
Exploitation
Not in CISA KEV at last sync

Original advisory: https://cert.europa.eu/publications/security-advisories/2026-007/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-41089coverage & exploitation statusNVD · CVE.org

Recent advisories for 2026-007

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CERT-EU Security Advisories