What is CVE-2026-70005?

CVE-2026-70005 is a medium-severity vulnerability in Microsoft Windows Server 2019, classified under Weak Authentication. CVSS score: 5.9/10. Published 2026-10-13.

How severe is CVE-2026-70005?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Microsoft Windows Server 2019

CVE-2026-70005

Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to bypass a security feature over a network.

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

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/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-1390 — Weak Authentication

References

Active Directory Federation Services (AD FS) Security Feature Bypass Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-70005?: CVE-2026-70005 is a medium-severity vulnerability in Microsoft Windows Server 2019, classified under Weak Authentication. CVSS score: 5.9/10. Published 2026-10-13.
How severe is CVE-2026-70005?: Medium severity. CVSS v3 base score is 5.9 out of 10.