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Severity by source

Vendor (microsoft) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

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.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 20:34 vuln.today
CVE Published
Jul 14, 2026 - 17:07 nvd
HIGH 7.5

DescriptionCVE.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

Access
Reach AD FS network endpoint
Delivery
Send crafted oversized request
Exploit
Overflow stack buffer in AD FS handler
Execution
Crash federation service
Impact
Deny SSO to dependent applications

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. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-50411 vulnerability details – vuln.today

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