CVE-2026-41939: Care Everywhere Gateway Hard-Coded Credential Exploit — Detection and Remediation

---
title: Care Everywhere Gateway - WildFly Management Port Access
id: 8a4b2c10-9d3e-4f5a-8b1c-2d3e4f5a6b7c
status: experimental
description: Detects inbound or established network connections to TCP port 20990, the default management port for the vulnerable WildFly instance in Care Everywhere Gateway.
references:
 - https://nvd.nist.gov/vuln/detail/CVE-2026-41939
author: Security Arsenal
date: 2026/04/06
tags:
 - attack.initial_access
 - attack.t1190
logsource:
 category: network_connection
 product: windows
detection:
 selection:
  DestinationPort: 20990
  Initiated: 'false'
 condition: selection
falsepositives:
  - Legitimate administrative access to WildFly console (Should be restricted internally)
level: high
---
title: WildFly Java Process Spawning Windows Shell
id: 9c5d3e21-0e4f-5a6b-9c2d-3e4f5a6b7c8d
status: experimental
description: Detects suspicious child processes (cmd.exe, powershell.exe) spawned by the Java service running WildFly. This indicates potential successful RCE via WAR deployment.
references:
 - https://nvd.nist.gov/vuln/detail/CVE-2026-41939
author: Security Arsenal
date: 2026/04/06
tags:
 - attack.execution
 - attack.t1059.001
logsource:
 category: process_creation
 product: windows
detection:
 selection:
  ParentImage|endswith: '\java.exe'
  Image|endswith:
   - '\cmd.exe'
   - '\powershell.exe'
 condition: selection
falsepositives:
  - Legitimate administrative scripting by Java applications
level: high

// Hunt for connections to WildFly Management Port 20990
DeviceNetworkEvents
| where RemotePort == 20990
| project Timestamp, DeviceName, InitiatingProcessFileName, RemoteIP, RemotePort, ActionType
| order by Timestamp desc

// Hunt for Java process spawning shells
DeviceProcessEvents
| where InitiatingProcessFileName =~ "java.exe" 
| where FileName in~ ("cmd.exe", "powershell.exe", "pwsh.exe")
| project Timestamp, DeviceName, AccountName, InitiatingProcessCommandLine, CommandLine, FolderPath
| order by Timestamp desc

-- Hunt for Listening WildFly Management Port
SELECT ListenAddress, Port, PID, Family
FROM listen_sock()
WHERE Port = 20990

-- Identify Care Everywhere Service Process
SELECT Pid, Name, Exe, CommandLine, Username
FROM pslist()
WHERE Name =~ "java.exe" AND CommandLine =~ "wildfly"

# CVE-2026-41939 Remediation Assessment Script

Write-Host "[+] Checking for WildFly Management Port 20990..." -ForegroundColor Cyan
$port20990 = Get-NetTCPConnection -LocalPort 20990 -ErrorAction SilentlyContinue

if ($port20990) {
    Write-Host "[!] ALERT: Port 20990 is LISTENING. Potential CVE-2026-41939 exposure." -ForegroundColor Red
    $port20990 | Select-Object LocalAddress, LocalPort, State, OwningProcess
    
    # Attempt to identify the process
    $proc = Get-Process -Id $port20990.OwningProcess -ErrorAction SilentlyContinue
    Write-Host "[+] Process Details:" -ForegroundColor Yellow
    $proc | Select-Object ProcessName, Id, Path
} else {
    Write-Host "[-] Port 20990 is not listening. System appears safe from remote exploitation vector." -ForegroundColor Green
}

Write-Host "`n[+] Checking for Care Everywhere Gateway Service..." -ForegroundColor Cyan
$service = Get-Service | Where-Object { $_.DisplayName -like "*Care Everywhere*" -or $_.Name -like "*Care Everywhere*" }

if ($service) {
    Write-Host "[!] ALERT: Care Everywhere Gateway Service Found." -ForegroundColor Red
    $service | Select-Object Name, DisplayName, Status, StartType
    Write-Host "[!] Action Required: Verify version. If 14.x.x, it is EOL and vulnerable." -ForegroundColor Red
} else {
    Write-Host "[-] Care Everywhere Gateway Service not found." -ForegroundColor Green
}

# Immediate Mitigation: Block Port 20990
Write-Host "`n[+] Mitigation: Blocking Port 20990 in Windows Firewall..." -ForegroundColor Cyan
try {
    New-NetFirewallRule -DisplayName "Block CVE-2026-41939 WildFly Port" -Direction Inbound -LocalPort 20990 -Protocol TCP -Action Block -ErrorAction Stop
    Write-Host "[+] Firewall rule created successfully." -ForegroundColor Green
} catch {
    Write-Host "[-] Firewall rule creation failed (may already exist)." -ForegroundColor Yellow
}