CVE-2026-25601: MEPIS RM Information Disclosure Flaw

CVE-2026-25601 Overview

A hardcoded credentials vulnerability was identified in MEPIS RM, an industrial software product developed by Metronik. The application contains a hardcoded cryptographic key within the Mx.Web.ComponentModel.dll component. When the option to store domain passwords is enabled, this key is used to encrypt user passwords before storing them in the application's database. An attacker with sufficient privileges to access the database could extract the encrypted passwords, decrypt them using the embedded key, and gain unauthorized access to the associated ICS/OT environment.

Critical Impact

Attackers with database access can decrypt stored domain passwords using the hardcoded key, potentially compromising industrial control systems and operational technology environments.

Affected Products

• MEPIS RM (Industrial Software by Metronik)
• Component: Mx.Web.ComponentModel.dll

Discovery Timeline

• 2026-04-01 - CVE-2026-25601 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-25601

Vulnerability Analysis

This vulnerability is classified as CWE-798: Use of Hard-coded Credentials. The core issue lies in the application's approach to cryptographic key management within the Mx.Web.ComponentModel.dll component. Rather than implementing proper key derivation or secure key storage mechanisms, the developers embedded a static cryptographic key directly in the application binary.

When organizations enable the domain password storage feature, user credentials are encrypted using this hardcoded key before being persisted to the database. While the encryption provides an apparent layer of security, the static nature of the key fundamentally undermines the protection. Any attacker who can extract the key from the DLL—through reverse engineering or binary analysis—can decrypt all stored passwords.

The local attack vector and high privilege requirements provide some mitigation, as exploitation requires the attacker to already have elevated access to either the database or the application binaries. However, in ICS/OT environments, the consequences of credential compromise can be severe, potentially allowing lateral movement into critical industrial control systems.

Root Cause

The root cause of this vulnerability is the use of a hardcoded cryptographic key embedded within the Mx.Web.ComponentModel.dll component. This design flaw violates fundamental secure coding principles that require cryptographic keys to be generated dynamically, stored securely, and managed independently from application code. The decision to embed the key directly in the binary means all installations share the same encryption key, creating a single point of failure for password security across all deployments.

Attack Vector

Exploitation of this vulnerability requires local access and high privileges. An attacker would need to:

1. Gain access to the MEPIS RM database where encrypted passwords are stored
2. Extract the hardcoded cryptographic key from the Mx.Web.ComponentModel.dll binary through reverse engineering
3. Use the extracted key to decrypt the stored domain passwords
4. Leverage the decrypted credentials to access the ICS/OT environment

The attack complexity is high due to the prerequisite of database access and the technical skill required for binary analysis. However, insider threats or attackers who have already achieved initial compromise pose a significant risk.

Detection Methods for CVE-2026-25601

Indicators of Compromise

• Unusual database queries targeting password storage tables in the MEPIS RM application
• Unauthorized access attempts to the Mx.Web.ComponentModel.dll file or its containing directory
• Evidence of binary analysis tools or reverse engineering activities on application servers
• Anomalous authentication events using domain credentials stored in MEPIS RM

Detection Strategies

• Monitor file access logs for attempts to read or copy the Mx.Web.ComponentModel.dll component
• Implement database activity monitoring to detect bulk extraction of encrypted credential data
• Deploy endpoint detection solutions to identify reverse engineering tools on systems with MEPIS RM installed
• Configure alerting for failed or successful authentication attempts from unexpected sources using ICS/OT credentials

Monitoring Recommendations

• Enable audit logging on the MEPIS RM database to track all queries against credential tables
• Implement file integrity monitoring on application binaries, particularly Mx.Web.ComponentModel.dll
• Monitor network traffic between MEPIS RM servers and ICS/OT systems for anomalous connection patterns
• Review authentication logs regularly for signs of credential misuse in the OT environment

How to Mitigate CVE-2026-25601

Immediate Actions Required

• Review the CERT SI Security Advisory for vendor-specific guidance
• Disable the domain password storage feature if operationally feasible until a patch is available
• Restrict database access to only essential personnel and services
• Implement network segmentation to isolate MEPIS RM systems from critical ICS/OT assets
• Rotate domain credentials that may have been stored in the affected application

Patch Information

Organizations should consult the CERT SI CVE-2026-25601 Advisory for official patch information and remediation guidance from Metronik. Contact the vendor directly to obtain the latest security updates addressing this vulnerability.

Workarounds

• Disable the "store domain passwords" option in MEPIS RM to prevent credential encryption using the hardcoded key
• Implement additional access controls on the database to limit credential data exposure
• Use network segmentation to restrict access to MEPIS RM servers and databases
• Deploy privileged access management (PAM) solutions to control and audit database access
• Consider implementing application-level encryption with externally managed keys as an additional protection layer