What is CVE-2026-70280?

CVE-2026-70280 is a medium-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under Incorrect Authorization. CVSS score: 4.4/10. Published 2026-10-13.

How severe is CVE-2026-70280?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Auth bypass in Microsoft Windows 10 Version 21h2

CVE-2026-70280

Incorrect authorization in Windows Hello allows an authorized attacker to bypass a security feature locally.

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

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-863 — Incorrect Authorization

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70280 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-70280?: CVE-2026-70280 is a medium-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under Incorrect Authorization. CVSS score: 4.4/10. Published 2026-10-13.
How severe is CVE-2026-70280?: Medium severity. CVSS v3 base score is 4.4 out of 10.