CVE-2026-83657
Windows Modern Device Management (MDM) Tampering Vulnerability
Microsoft Windows 10 Version 1809Operating systems
CVSS
5.5MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.22%Chance of exploitation activity in the next 30 days, higher than 12% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 10.0.17763.9376Windows 10 Version 1809CVE List
- 10.0.17763.9376Windows Server 2019CVE List
- 10.0.17763.9376Windows Server 2019 (Server Core installation)CVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Vendor and government advisories 1
Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.
Reports 1
1 outlet mention it. Reports are not confirmation; each links to its source.
Description
Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Text from CVE List
Affected versions 3
- Windows 10 Version 1809affected: 10.0.17763.0 before 10.0.17763.9376CVE List
- Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.9376CVE List
- Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.9376CVE List