Active Directory Federation Services (AD FS) Security Feature Bypass Vulnerability
MonitorCVSS 5.9CVE-2026-69982Oct 13, 2026
Microsoft
IT in OT - Windows Server and Active Directory are widely deployed in OT environments
Attack path
Attack VectorNetwork
Auth RequiredNone
ComplexityHigh
User InteractionNone needed
Summary
Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to bypass a security feature over a network.
What this means
What could happen
Could allow unauthorized modification of device settings or firmware
Who's at risk
Organizations in critical infrastructure using Microsoft equipment
How it could be exploited
Attacker on the corporate network or internet could reach this device without any credentials
Exploitability
Unlikely to be exploited — EPSS score 0.6%
Affected products (12)
12 with fix
ProductAffected VersionsFix Status
Remediation & Mitigation
0/1
Long-term hardening
0/1Exploitation assessment: Exploitation Less Likely. Apply the 2026-Oct security update.
CVEs (1)
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