What is CVE-2026-105009?

CVE-2026-105009 is a high-severity vulnerability in Microsoft Windows Server 2012, classified under Incorrect Default Permissions. CVSS score: 7.5/10. Published 2026-10-13.

How severe is CVE-2026-105009?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Microsoft Windows Server 2012

CVE-2026-105009

Incorrect default permissions in Windows Server Update Service allows an authorized attacker to elevate privileges locally.

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

Windows Server Update Service Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-105009?: CVE-2026-105009 is a high-severity vulnerability in Microsoft Windows Server 2012, classified under Incorrect Default Permissions. CVSS score: 7.5/10. Published 2026-10-13.
How severe is CVE-2026-105009?: High severity. CVSS v3 base score is 7.5 out of 10.