What is CVE-2026-88245?

CVE-2026-88245 is a high-severity vulnerability in Microsoft Windows Server 2025, classified under Missing Authentication for Critical Function. CVSS score: 7.8/10. Published 2026-11-10.

How severe is CVE-2026-88245?

High severity. CVSS v3 base score is 7.8 out of 10.

Auth bypass in Microsoft Windows Server 2025

CVE-2026-88245

Missing authentication for critical function in Windows Brokering File System allows an authorized attacker to elevate privileges locally.

Vulnerability class: Broken Authentication

Published 2026-11-10 · last modified 2026-11-11.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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-306 — Missing Authentication for Critical Function

References

Windows Brokering File System Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-88245?: CVE-2026-88245 is a high-severity vulnerability in Microsoft Windows Server 2025, classified under Missing Authentication for Critical Function. CVSS score: 7.8/10. Published 2026-11-10.
How severe is CVE-2026-88245?: High severity. CVSS v3 base score is 7.8 out of 10.