What is CVE-2026-83657?

CVE-2026-83657 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows Modern Device Management (MDM) Tampering Vulnerability

Which CVE IDs does CVE-2026-83657 cover?

CVE-2026-83657 covers the following CVE IDs: CVE-2026-83657. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-83657?

CVE-2026-83657 has a CVSS v3 base score of 5.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-83657?

CVE-2026-83657 affects 4 products, including: Windows 10 Version 1809 for 32-bit Systems; Windows 10 Version 1809 for x64-based Systems; Windows Server 2019; Windows Server 2019 (Server Core installation).

CVE-2026-83657HighCVSS 5.5

Windows Modern Device Management (MDM) Tampering Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

October 13, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-83657 →

📋 Description

Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.

🎯 Affected products4

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)

✅ Remediation

KB5126651 (Security Update) — fixed build 10.0.17763.9376

🔗 References (3)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83657
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5126651
referencehttps://support.microsoft.com/help/5126651