What is CVE-2026-35438?

CVE-2026-35438 is a high-severity vulnerability in Microsoft Windows Admin Center, classified under Missing Authorization. CVSS score: 8.3/10. Published 2026-05-12.

How severe is CVE-2026-35438?

High severity. CVSS v3 base score is 8.3 out of 10.

Auth bypass in Microsoft Windows Admin Center

CVE-2026-35438

Missing authorization in Windows Admin Center allows an authorized attacker to elevate privileges over a network.

Vulnerability class: Broken Access Control

Published 2026-05-12 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.6th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.001

Affected products

Microsoft Windows Admin Center — versions 1809.0
Microsoft Windows Admin Center

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35438 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-35438?: CVE-2026-35438 is a high-severity vulnerability in Microsoft Windows Admin Center, classified under Missing Authorization. CVSS score: 8.3/10. Published 2026-05-12.
How severe is CVE-2026-35438?: High severity. CVSS v3 base score is 8.3 out of 10.