CVE-2026-83654

Local privilege escalation via missing function authentication

Published Oct 13, 2026 · Updated Oct 13, 2026

Missing authentication in Microsoft Windows Modern Device Management allows local users to elevate privileges through a critical function. The CNA record does not disclose the function's name, its input, or the failing authentication operation. Exploitation requires existing low-privileged local access; the record does not specify the resulting privilege level or whether MDM enrollment is required.

CVSS severity7.8

High

EPSS probability0.28%

Next 30 days · Oct 19, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2026-83654
Published: Oct 13, 2026
Updated: Oct 13, 2026

Vendor: Microsoft Corporation
Product: Windows Server 2025 (Server Core installation)
Classifications: CWE-306, T1068

Attack vector: local
Privileges: authenticated

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?

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 10 Version 21H2version=10.0.19044.0 <10.0.19044.7807

Microsoft Corporation · Windows 11, version 26H2version=10.0.26300.0 <10.0.26300.9711

Microsoft Corporation · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19044.7807

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

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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-306Missing Authentication for Critical Function

T1068Exploitation for Privilege Escalation

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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