Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable AD FS endpoint, unauthenticated and no user interaction (PR:N/UI:N), low complexity; impact limited to service crash so A:H with C:N/I:N.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
Stack-based buffer overflow in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
AnalysisAI
Denial of service in Microsoft Active Directory Federation Services (AD FS) allows a remote, unauthenticated attacker to crash the service by sending crafted network input that overflows a stack buffer (CWE-121). Because AD FS commonly fronts single sign-on for Microsoft 365, Azure AD, and federated web applications, an outage cascades into loss of authentication for every relying-party application. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker needs network access to a reachable AD FS endpoint (typically the AD FS server or an externally published Web Application Proxy) on a Windows host running the AD FS role. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are internally consistent but modest. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach the AD FS or Web Application Proxy endpoint over the network sends a specially crafted request whose oversized field overflows a stack buffer in the AD FS request-handling code, crashing the service without any credentials or user interaction. Repeated requests keep the federation service down, denying single sign-on to all dependent Microsoft 365 and web applications. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50411 to every affected Windows host running the AD FS role: Vendor-released patch available per Microsoft advisory (Patch available per vendor advisory) - obtain the exact KB/build for your OS version from https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50411 and deploy via Windows Update, WSUS, or your patch-management pipeline, prioritizing internet-facing AD FS servers and Web Application Proxy (WAP) instances first. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all AD FS servers for current patch status and prepare your test environment for validation. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44073
GHSA-576r-hwq5-jr7g