CVE-2026-85321 Active Directory Federation Services - Denial of Service

Active Directory Federation Services contains a denial of service vulnerability caused by allocation of resources without limits or throttling, letting unauthorized attackers deny service over a network, exploit requires network access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
1.06% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to the latest version of Active Directory Federation Services.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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