CVE-2026-26034
📋 TL;DR
CVE-2026-26034 is an incorrect default permissions vulnerability in Dell UPS Multi-UPS Management Console (MUMC) that allows attackers to execute arbitrary code with SYSTEM privileges by loading a malicious DLL. This affects MUMC version 01.06.0001 (A03) on Windows systems where the vulnerable software is installed.
💻 Affected Systems
- Dell UPS Multi-UPS Management Console (MUMC)
⚠️ 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
Full system compromise with SYSTEM privileges leading to complete control of the host, data theft, ransomware deployment, and lateral movement within the network.
Likely Case
Attacker gains SYSTEM privileges on affected systems, enabling installation of persistent backdoors, credential harvesting, and further network exploitation.
If Mitigated
Limited impact if proper network segmentation, least privilege principles, and monitoring are implemented to detect and contain exploitation attempts.
🎯 Exploit Status
Exploitation requires the ability to place a malicious DLL in a location where the application will load it. This typically requires some level of access to the target system.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Dell support for updated version
Vendor Advisory: https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=038h3
Restart Required: Yes
Instructions:
1. Visit the Dell support page for MUMC updates
2. Download and install the latest version of MUMC
3. Restart the system to ensure changes take effect
4. Verify the installation completed successfully
🔧 Temporary Workarounds
Restrict DLL loading permissions
windowsModify file system permissions to prevent unauthorized DLL placement in MUMC directories
icacls "C:\Program Files\Dell\MUMC\" /deny Everyone:(OI)(CI)(W)
Remove unnecessary MUMC installations
windowsUninstall MUMC from systems where it is not required for UPS management
appwiz.cpl
🧯 If You Can't Patch
- Implement strict network segmentation to isolate systems running MUMC
- Apply principle of least privilege and monitor for suspicious DLL loading activity
🔍 How to Verify
Check if Vulnerable:
Check MUMC version in Control Panel > Programs and Features or by examining the installed software versionCheck Version:
wmic product where name="Dell UPS Multi-UPS Management Console" get versionVerify Fix Applied:
Verify MUMC version is updated beyond 01.06.0001 (A03) and test DLL loading behavior📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing DLL loading from unusual locations
- Security logs with process creation events from MUMC with suspicious parent processes
Network Indicators:
- Unusual outbound connections from systems running MUMC
- Network traffic to/from MUMC management ports from unauthorized sources
SIEM Query:
source="windows" AND (event_id=4688 OR event_id=7) AND process_name="*MUMC*" AND (parent_process!="explorer.exe" OR image_loaded="*suspicious*.dll")