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CVE-2026-78444 Microsoft CVE debrief

CVE-2026-78444 is a high-severity vulnerability in Windows Failover Cluster that allows an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.1 and is considered high severity. Microsoft has released a patch for this vulnerability, and defenders should prioritize patching to prevent exploitation. The vulnerability is an untrusted pointer dereference that can be exploited over a network. Defenders should verify affected systems are up-to-date with the latest security patches and monitor system logs for potential exploitation attempts. The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and affected A

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-11
Advisory published
2026-09-08
Advisory updated
2026-09-11

Who should care

Defenders responsible for Windows Failover Cluster systems should prioritize patching to prevent potential exploitation. System administrators and security teams should verify affected systems are up-to-date with the latest security patches and monitor system logs for potential exploitation attempts.

Why it matters

CVE-2026-78444 is a high-severity vulnerability in Windows Failover Cluster that allows an unauthorized attacker to execute code over a network. Defenders should prioritize patching to prevent exploitation.

  • Potential code execution over a network
  • High severity vulnerability with CVSS score of 8.1
  • Patching vulnerable systems is a high priority to prevent exploitation

Technical summary

The vulnerability is an untrusted pointer dereference in Windows Failover Cluster that allows an unauthorized attacker to execute code over a network. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. The vulnerability affects Windows Failover Cluster systems and has a high severity CVSS score of 8.1. Microsoft has released a patch for this vulnerability, and defenders should prioritize patching to prevent exploitation. Defenders should verify affected systems are up-to-date with the latest security patches and monitor system logs for potential

Defensive priority

Patching vulnerable systems is a high priority to prevent potential code execution.

Recommended defensive actions

  • Patch vulnerable Windows Failover Cluster systems
  • Verify affected systems are up-to-date with the latest security patches
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and affected systems. However, there is limited information on potential exploitation or impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78444 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78444

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-78444 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78444

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.