Local tampering via missing critical-function authentication
Published Oct 13, 2026 · Updated Oct 13, 2026
Missing authentication in Microsoft Windows Modern Device Management allows local users to tamper with data via a critical function. The supplied record does not identify the function, affected data, or unchecked operation, and public CNA and vendor records were inaccessible. Exploitation requires an authorized attacker acting locally; the exact privileges, configuration requirements, and extent of tampering remain unspecified.
Summary
What happened
Missing authentication in Microsoft Windows Modern Device Management allows local users to tamper with data via a critical function. The supplied record does not identify the function, affected data, or unchecked operation, and public CNA and vendor records were inaccessible. Exploitation requires an authorized attacker acting locally; the exact privileges, configuration requirements, and extent of tampering remain unspecified.
The record
- CVE
- CVE-2026-83656
- Published
- Oct 13, 2026
- Updated
- Oct 13, 2026
- Vendor
- Microsoft Corporation
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 13, 2026CVE publishedPublication date reported by the CVE source.
- Oct 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.26100.0 <10.0.26100.33650
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
No sourced classifications are available.
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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