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Windows Failover Cluster CVE-2026-78444

| EUVDEUVD-2026-73800 HIGH
Untrusted Pointer Dereference (CWE-822)
2026-09-08 secure@microsoft.com GHSA-vp2w-vv5p-6vcv
Microsoft Windows 10 1809 Windows Server 2019 Windows Server 2022 Windows Server 2025
8.1
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.1 HIGH

Network-reachable Cluster service requires no authentication (PR:N), but AC:H reflects the non-trivial exploitation complexity for reliable pointer control; full C/I/A impact is consistent with arbitrary code execution.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Metadata Corrected
Sep 08, 2026 - 20:40 vuln.today
tag: Authentication Bypass removed
Analysis Generated
Sep 08, 2026 - 20:02 vuln.today
Patch available
Sep 08, 2026 - 18:35 EUVD
CVE Published
Sep 08, 2026 - 18:20 nvd
HIGH 8.1

DescriptionCVE.org

Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.

AnalysisAI

Remote code execution in Windows Failover Cluster allows an unauthenticated network attacker to fully compromise affected Windows Server systems by triggering an untrusted pointer dereference (CWE-822) over the network. Affected deployments span Windows Server 2019, 2022, and 2025 (including Server Core variants) and Windows 10 Version 1809, with vendor-released patches available via Microsoft Security Response Center. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The target Windows system must have the Failover Clustering feature explicitly installed and the Cluster Service (clussvc.exe) actively running and reachable from the attacker's network position. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.1 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) reflects a genuinely severe but non-trivial-to-exploit vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patches are available through Microsoft Update. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Windows Server 2019, 2022, and 2025 systems (including Server Core) and Windows 10 Version 1809 installations with Failover Cluster services enabled using asset management or Active Directory queries. …

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CVE-2026-78444 vulnerability details – vuln.today
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