What is CVE-2026-70005?

CVE-2026-70005 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Active Directory Federation Services (AD FS) Security Feature Bypass Vulnerability

Which CVE IDs does CVE-2026-70005 cover?

CVE-2026-70005 covers the following CVE IDs: CVE-2026-70005. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-70005?

CVE-2026-70005 has a CVSS v3 base score of 5.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-70005?

CVE-2026-70005 affects 6 products, including: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server 2022; Windows Server 2022 (Server Core installation); Windows Server 2025; and others — see the full list on the advisory page.

CVE-2026-70005HighCVSS 5.9

Active Directory Federation Services (AD FS) Security Feature Bypass Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

October 13, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-70005 →

📋 Description

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

🎯 Affected products6

Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Remediation

KB5126651 (Security Update) — fixed build 10.0.17763.9376 KB5126655 (Security Update) — fixed build 10.0.20348.5761 KB5126646 (Security Update) — fixed build 10.0.26100.33650

🔗 References (7)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70005
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5126651
referencehttps://support.microsoft.com/help/5126651
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5126655
referencehttps://support.microsoft.com/help/5126655
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5126646
referencehttps://support.microsoft.com/help/5126646