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CVE-2026-50647: Active Directory Federation Server Denial of Service Vulnerability

highCVSS 7.5CVE-2026-50647
Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

CSIRTS triage

vendor: Microsoftproduct: Active Directory Federation ServicesDenial of service
What
Loop with unreachable exit condition in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.
Who is affected
Unauthorized attackers targeting Active Directory Federation Services.
Urgency
Remediation is urgent due to the high severity and potential for denial of service.
Action
Install the latest updates for Active Directory Federation Services.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50647

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-50647coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Active Directory Federation

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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