CVE-2026-83697: Windows Modern Device Management (MDM) Tampering Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Other sources
Windows Modern Device Management (MDM) Tampering Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648
Event History
Frequently Asked Questions
Who can exploit this vulnerability?
An attacker must already be authorized on the affected Windows system and able to act locally. The published vector indicates low privileges are sufficient, but exploitation has high attack complexity.
Are remotely accessible systems exposed through this issue?
The attack vector is local, so this issue is not described as remotely exploitable. A remote attacker would first need a way to obtain authorized local access to an affected device.
What security impact could successful exploitation have?
Successful exploitation can result in tampering, reflected as an integrity impact. No confidentiality or availability impact is identified in the provided severity vector.
Which systems should be reviewed?
Review deployments of Windows 10, Windows 11, Windows Server 2019, Windows Server 2022, Windows Server 2025, and Windows Modern Device Management (MDM). The supplied information does not identify affected or fixed build versions.