Medium severity · published Oct 13, 2026
CVE-2026-83657
Windows Modern Device Management (MDM) Tampering Vulnerability
5.5
CVSS
0.3%
EPSS
No
On KEV
Description
Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 10 Version 1809 · Microsoft
10.0.17763.0 before 10.0.17763.9376 · source: vendor
WS
Windows Server 2019 · Microsoft
10.0.17763.0 before 10.0.17763.9376 · source: vendor
WS
Windows Server 2019 (Server Core installation) · Microsoft
10.0.17763.0 before 10.0.17763.9376 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83657
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83657
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83657
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