Windows SMB Client Elevation of Privilege Vulnerability
Plan PatchCVSS 8.8CVE-2026-83789Oct 13, 2026
Microsoft
IT in OT - Windows Server and Active Directory are widely deployed in OT environments
Attack path
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary
Heap-based buffer overflow in Windows SMB Client allows an unauthorized attacker to elevate privileges over a network.
What this means
What could happen
Could allow full system compromise — read data, modify settings, and disrupt operations
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. The attack is straightforward with no special conditions
Exploitability
Unlikely to be exploited — EPSS score 0.8%
Affected products (28)
28 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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