CVE-2026-20862
📋 TL;DR
This vulnerability in Windows Management Services allows an authenticated attacker to access sensitive information from the local system. It affects Windows systems with specific management services enabled. Attackers must already have local access to exploit this information disclosure flaw.
💻 Affected Systems
- Windows Management Services
📦 What is this software?
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 25h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could access sensitive system information, configuration data, or credentials stored locally, potentially enabling further privilege escalation or lateral movement.
Likely Case
Local users with standard privileges could access information they shouldn't normally see, potentially revealing system details or configuration information.
If Mitigated
With proper access controls and monitoring, impact is limited to information disclosure without enabling further system compromise.
🎯 Exploit Status
Requires authenticated local access to exploit
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific patch versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20862
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates from Microsoft 2. Restart affected systems 3. Verify patch installation via Windows Update history
🔧 Temporary Workarounds
Disable Windows Management Services
windowsTemporarily disable affected management services if not required
sc stop "ServiceName"
sc config "ServiceName" start= disabled
Restrict Local Access
windowsImplement strict local access controls and user privilege management
🧯 If You Can't Patch
- Implement strict least privilege access controls for local users
- Enable detailed auditing and monitoring of Windows Management Services access
🔍 How to Verify
Check if Vulnerable:
Check Windows version and patch level against Microsoft advisoryCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history shows the specific security update installed📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to Windows Management Services
- Multiple failed then successful authentication attempts
Network Indicators:
- Local system calls to management service interfaces
SIEM Query:
EventID=4688 AND ProcessName contains "management" OR EventID=4663 AND ObjectName contains "management"