CVE-2026-20892
📋 TL;DR
A code injection vulnerability in MR-GM5L-S1 and MR-GM5A-L1 devices allows authenticated administrators to execute arbitrary commands on affected systems. This affects organizations using these specific Mitsubishi Electric industrial automation products. Attackers with administrative access can potentially compromise device integrity and functionality.
💻 Affected Systems
- MR-GM5L-S1
- MR-GM5A-L1
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to disruption of industrial processes, data exfiltration, or lateral movement into connected systems.
Likely Case
Unauthorized command execution by malicious insiders or compromised admin accounts, potentially disrupting device operations.
If Mitigated
Limited impact due to proper access controls, network segmentation, and monitoring preventing unauthorized administrative access.
🎯 Exploit Status
Requires administrative access. Exploitation likely involves injecting commands through vulnerable interfaces.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.mrl.co.jp/download/security/JVNVU98103854.pdf
Restart Required: Yes
Instructions:
1. Review vendor advisory at provided URL. 2. Download and apply firmware updates from Mitsubishi Electric. 3. Restart affected devices. 4. Verify patch application.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative access to only necessary personnel using principle of least privilege.
Network Segmentation
allIsolate affected devices in separate network segments with strict firewall rules.
🧯 If You Can't Patch
- Implement strict access controls and multi-factor authentication for administrative accounts
- Monitor administrative activity and command execution logs for suspicious patterns
🔍 How to Verify
Check if Vulnerable:
Check device model and firmware version against vendor advisory. Devices must be MR-GM5L-S1 or MR-GM5A-L1 models.Check Version:
Check device web interface or console for firmware version information (vendor-specific commands vary)Verify Fix Applied:
Verify firmware version has been updated to patched version specified in vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual administrative login attempts
- Unexpected command execution patterns
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from industrial devices
- Traffic to unexpected ports from affected devices
SIEM Query:
source="industrial_device" AND (event_type="admin_login" OR event_type="command_execution") | stats count by user, command