CVE-2026-84011
Windows SMB Client Security Feature Bypass Vulnerability
MEDIUM
5.5
CVSS Score
Published: October 13, 2026 at 06:59 PM UTC
Updated: October 29, 2026 at 03:12 PM UTC
8 products affected across 1 vendorWindows Server 2022Windows Server 2025Windows 11 24H2
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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit
Description
Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 10.0.22631.765210.0.22631.0
v < 10.0.26100.971110.0.26100.0
v < 10.0.26200.971110.0.26200.0
v < 10.0.28000.323110.0.28000.0
v < 10.0.26300.9711
v < 10.0.20348.576110.0.20348.0
v < 10.0.26100.3365010.0.26100.0
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84011SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.5MEDIUMmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-863
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