Vulnerabilities
CVE-2026-83657: Windows MDM Weak Authentication Enables Local Tampering
A flaw in Windows Modern Device Management (MDM) authentication allows an attacker with local privileges to modify MDM configurations. The vulnerability can be exploited on Windows 10/11 systems that use MDM for device management. Apply the latest security update or disable MDM to mitigate.
What happened
Microsoft identified a weakness in the authentication flow of Windows MDM that permits an attacker who has already authenticated to a device to tamper with MDM settings. The flaw does not require elevated privileges beyond those granted by the attacker’s existing account.
Impact
Systems that rely on MDM for policy enforcement, application deployment, or device configuration can be compromised. An attacker could alter policies, install malicious software, or bypass security controls, potentially affecting all devices managed through the compromised MDM profile.
What to do
- Install the security update that addresses CVE-2026-83657 (available through Windows Update or WSUS).
- Verify that MDM authentication is configured to require multi‑factor or stronger credentials.
- Audit MDM policies for unexpected changes and monitor device logs for anomalous activity.
- Consider disabling MDM on devices that do not require it until a patch is applied.
Related vulnerabilities
CVE-2026-83715: Windows Error Reporting Tampering Vulnerability
Microsoft identified a missing authentication check in Windows Error Reporting that allows a local attacker with authorized access to tamper with error reports. The flaw can be used to modify or delete diagnostic data, potentially masking malicious activity. Defenders should apply the latest security update and consider disabling WER on systems where it is not required.
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NoMachine Redis Authentication Flaw Enables Local Privilege Escalation (CVE-2026-92209)
A flaw in NoMachine’s Redis authentication allows local attackers to elevate privileges after gaining low‑privileged code execution. The issue stems from weak credential generation and affects versions prior to v10.1.7, v9.9.6, and v8.27.1. Defenders should patch immediately and monitor for local privilege escalation attempts.
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Microsoft DNS Server Vulnerability CVE-2026-70083 Enables Local Tampering
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CVE-2026-70063: Local Windows Kernel Information Disclosure Vulnerability
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