CVE-2026-70005

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

CVE-2026-70005 is fixed in 6 products on 1 platform, first by KB5126651, released October 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.9

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0063

50th percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2019	17763.9376	KB5126651	Oct 13, 2026
Windows Server 2019 (Server Core installation)	17763.9376	KB5126651	Oct 13, 2026
Windows Server 2022	20348.5761	KB5126655	Oct 13, 2026
Windows Server 2022 (Server Core installation)	20348.5761	KB5126655	Oct 13, 2026
Windows Server 2025	26100.33650	KB5126646	Oct 13, 2026
Windows Server 2025 (Server Core installation)	26100.33650	KB5126646	Oct 13, 2026

Details

Published
October 13, 2026
Weakness
Weak Authentication
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70005

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