CVE-2026-72978

Active Directory Federation Services (AD FS) Denial of Service Vulnerability

CVE-2026-72978 is fixed in 16 products on 1 platform, first by KB5123099, released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.9

Important

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0098

62nd percentile

<p>Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 10 Version 1607 for 32-bit Systems	14393.9512	KB5123099	Sep 8, 2026
Windows 10 Version 1607 for x64-based Systems	14393.9512	KB5123099	Sep 8, 2026
Windows 10 Version 1809 for 32-bit Systems	17763.9245	KB5122876	Sep 8, 2026
Windows 10 Version 1809 for x64-based Systems	17763.9245	KB5122876	Sep 8, 2026
Windows Server 2012		KB5123065	Sep 8, 2026
Windows Server 2012 (Server Core installation)		KB5123065	Sep 8, 2026
Windows Server 2012 R2		KB5123066	Sep 8, 2026
Windows Server 2012 R2 (Server Core installation)		KB5123066	Sep 8, 2026
Windows Server 2016	14393.9512	KB5123099	Sep 8, 2026
Windows Server 2016 (Server Core installation)	14393.9512	KB5123099	Sep 8, 2026
Windows Server 2019	17763.9245	KB5122876	Sep 8, 2026
Windows Server 2019 (Server Core installation)	17763.9245	KB5122876	Sep 8, 2026
Windows Server 2022	20348.5622	KB5122882	Sep 8, 2026
Windows Server 2022 (Server Core installation)	20348.5622	KB5122882	Sep 8, 2026
Windows Server 2025	26100.33438	KB5122871	Sep 8, 2026
Windows Server 2025 (Server Core installation)	26100.33438	KB5122871	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Allocation of Resources Without Limits or Throttling
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72978

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