CVE-2026-69403

Local information disclosure via missing authorization

Published Sep 8, 2026 · Updated Sep 10, 2026

Missing authorization in Windows SMB Server allows local users with low privileges to disclose information on affected Windows systems. Microsoft has not published the request path, data object, or authorization check that incorrectly permits the disclosure. Local access and low privileges are required, and the documented impact is limited to reading information without modification or service interruption.

CVSS severity5.5
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Windows SMB Server allows local users with low privileges to disclose information on affected Windows systems. Microsoft has not published the request path, data object, or authorization check that incorrectly permits the disclosure. Local access and low privileges are required, and the documented impact is limited to reading information without modification or service interruption.

The record

CVE
CVE-2026-69403
Published
Sep 8, 2026
Updated
Sep 10, 2026
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-862, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=10.0.17763.0 <10.0.17763.9245

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.9245
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33438
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.9445
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.9512
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.9445
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.7725
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.9512
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.7725
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.9245
Microsoft · Windows 11, version 26H1version=10.0.28000.0 <10.0.28000.2954
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.7582
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.9512
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.5622
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.33438
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.9245

Published CVSS scores

5.5MicrosoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1005Data from Local System

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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