CVE intelligence

CVE-2026-72989

Vulnerability intelligence

Published Sep 8, 2026Sources checked Oct 27, 2026

7.5HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-72989 and is rated High severity with a CVSS score of 7.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Sep 8, 2026

Install KB5122876. Install KB5122882. Install KB5122871.

Vendor-listed releases

10.0.17763.9245
10.0.20348.5622
10.0.26100.33438

CISA KEVNot listedBased on the latest collected catalog

EPSS1.0%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-72989?

Use of uninitialized resource in Windows Failover Cluster allows an unauthorized attacker to disclose information over a network.

Source: NVD