Windows SMB Client Security Feature Bypass Vulnerability
MonitorCVSS 5.5CVE-2026-84011Oct 13, 2026
Microsoft
IT in OT - Windows Server and Active Directory are widely deployed in OT environments
Attack path
Attack VectorLocal
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary
Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.
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 would need local or console access to the device with basic access credentials. The attack is straightforward with no special conditions
Exploitability
Unlikely to be exploited — EPSS score 0.3%
Affected products (14)
14 with fix
ProductAffected VersionsFix Status
Remediation & Mitigation
0/1
Long-term hardening
0/1Exploitation assessment: Exploitation Unlikely. Apply the 2026-Oct security update.
CVEs (1)
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