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CVE-2026-50355: Windows Active Directory Federation Services Denial of Service Vulnerability

highCVSS 7.5CVE-2026-50355
Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.

CSIRTS triage

vendor: Microsoftproduct: Active Directory Federation ServicesDenial of service
What
Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.
Who is affected
Deployments of Active Directory Federation Services.
Urgency
Remediation is urgent due to high severity and potential for denial of service.
Action
Apply the latest security patch 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-2026-50355

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-2026-50355coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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