CVE-2026-84011

Local security feature bypass

Published Oct 13, 2026 · Updated Oct 13, 2026

Incorrect authorization in Microsoft Windows SMB Client allows local users to bypass a security feature via unspecified vectors. The public record does not identify the authorization check or the security feature it fails to enforce. Exploitation requires existing low-privileged access; the disclosed consequence is a local security feature bypass, with no additional operational impact described.

CVSS severityUnavailable
Unscored
EPSS probability0.29%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Microsoft Windows SMB Client allows local users to bypass a security feature via unspecified vectors. The public record does not identify the authorization check or the security feature it fails to enforce. Exploitation requires existing low-privileged access; the disclosed consequence is a local security feature bypass, with no additional operational impact described.

The record

CVE
CVE-2026-84011
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Microsoft Corporation
Product
Windows Server 2025 (Server Core installation)
Classifications
CWE-863
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.26100.0 <10.0.26100.33650

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft Corporation · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33650
Microsoft Corporation · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.9711
Microsoft Corporation · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.9711
Microsoft Corporation · Windows 11, version 26H2version=10.0.26300.0 <10.0.26300.9711
Microsoft Corporation · Windows 11, version 26H1version=10.0.28000.0 <10.0.28000.3231
Microsoft Corporation · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.7652
Microsoft Corporation · Windows Server 2022version=10.0.20348.0 <10.0.20348.5761
Microsoft Corporation · Windows Server 2025version=10.0.26100.0 <10.0.26100.33650

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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