CVE-2026-85319

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Allocation of Resources Without Limits in Active Directory Federation Services

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-85319

EUVD

EUVD-2026-99460

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	Server 2012 6.2.9200.0
Microsoft	Windows	Server 2012 (Server Core installation) 6.2.9200.0
Microsoft	Windows	Server 2012 R2 6.3.9600.0
Microsoft	Windows	Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-770	The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Attack-Flow Graph

Executive Summary

This vulnerability involves Active Directory Federation Services (AD FS) not properly limiting or throttling resource allocation. An unauthorized attacker can exploit this to consume excessive resources over a network, causing a denial of service (DoS) where legitimate users cannot access services.

Detection Guidance

Monitor AD FS service logs for unusual resource consumption or repeated failed authentication attempts. Check for network traffic spikes targeting AD FS endpoints. Use Windows Event Viewer to inspect logs under Applications and Services Logs > AD FS > Admin.

Impact Analysis

If you use AD FS in your environment, an attacker could disrupt services by overwhelming the system with requests. This may lead to downtime, loss of access for users, and potential disruption of critical operations relying on AD FS.

Mitigation Strategies

Apply the latest security updates from Microsoft for AD FS. Limit network exposure by restricting access to AD FS servers via firewalls. Monitor and throttle incoming requests to AD FS services to prevent resource exhaustion.

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