EUVD-2026-5619: Comprehensive Technical Analysis

Executive Summary

EUVD-2026-5619 (CVE-2026-25751) represents a critical information disclosure vulnerability in FUXA, an open-source web-based SCADA/HMI visualization platform. The vulnerability enables unauthenticated remote attackers to extract sensitive administrative database credentials, resulting in a CVSS 4.0 base score of 9.1 (Critical). This vulnerability poses significant risks to industrial control systems and operational technology environments across Europe.

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1. Vulnerability Assessment and Severity Evaluation

Severity Analysis

• CVSS 4.0 Score: 9.1 (Critical)
• Attack Vector (AV:N): Network-accessible, requiring no physical or local access
• Attack Complexity (AC:L): Low complexity, indicating straightforward exploitation
• Attack Requirements (AT:P): Present, suggesting some preconditions must be met
• Privileges Required (PR:N): No authentication required
• User Interaction (UI:N): No user interaction necessary

Impact Assessment

Vulnerable System Impact:

• Confidentiality (VC:H): High - Complete disclosure of administrative credentials
• Integrity (VI:N): None - Direct exploitation doesn't modify vulnerable system
• Availability (VA:N): None - Direct exploitation doesn't affect vulnerable system availability

Subsequent System Impact (Database):

• Confidentiality (SC:H): High - Full access to historical process data
• Integrity (SI:H): High - Ability to modify or corrupt database contents
• Availability (SA:H): High - Potential for complete database denial of service

Risk Classification

This vulnerability represents a critical security flaw due to:

• Zero authentication requirements
• Remote exploitation capability
• Direct exposure of administrative credentials
• Cascading impact on connected systems (InfluxDB)
• Potential for complete compromise of industrial process data

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2. Potential Attack Vectors and Exploitation Methods

Primary Attack Vector

Unauthenticated Information Disclosure: The vulnerability allows remote attackers to retrieve system configuration data containing plaintext or weakly protected database credentials without any authentication.

Likely Exploitation Scenarios

Stage 1: Initial Reconnaissance

1. Attacker identifies FUXA instance exposed to network
2. Performs version fingerprinting (vulnerable: ≤ 1.2.9)
3. Identifies accessible configuration endpoints

Stage 2: Credential Extraction

4. Exploits information disclosure vulnerability
5. Retrieves system configuration containing:
   - InfluxDB administrative credentials
   - Database connection strings
   - Potentially other sensitive configuration data

Stage 3: Lateral Movement

6. Authenticates directly to InfluxDB using extracted credentials
7. Gains full administrative access to time-series database

Stage 4: Impact Realization

Attacker can now:
- Exfiltrate historical SCADA/process data
- Modify sensor readings and process measurements
- Delete critical operational data
- Corrupt database to cause denial of service
- Establish persistence within the database layer

Technical Exploitation Characteristics

Probable Vulnerability Mechanisms:

• Exposed API endpoints returning configuration data
• Insufficient access controls on administrative interfaces
• Configuration files accessible via web server
• Debug/diagnostic endpoints left enabled in production
• Improper authentication checks on sensitive routes

Attack Surface

• Internet-facing FUXA installations: Highest risk
• Internal network deployments: Risk from insider threats or compromised systems
• Cloud-hosted instances: Exposed to broader threat landscape

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3. Affected Systems and Software Versions

Vulnerable Software

• Product: FUXA (Web-based SCADA/HMI/Dashboard)
• Vendor: frangoteam
• Affected Versions: All versions through 1.2.9 (inclusive)
• Patched Version: 1.2.10 and later

Deployment Context

Typical Affected Environments:

• Industrial Control Systems (ICS)
• Supervisory Control and Data Acquisition (SCADA) systems
• Human-Machine Interface (HMI) implementations
• Manufacturing execution systems
• Building automation systems
• Energy management platforms
• Water/wastewater treatment facilities
• Smart grid infrastructure

Secondary Affected Systems

• InfluxDB instances: Connected time-series databases storing process data
• Downstream monitoring systems: Relying on FUXA data integrity
• Industrial networks: Potentially exposed to lateral movement

European Sector Impact

Given FUXA's application in industrial environments, affected sectors likely include:

• Manufacturing (automotive, pharmaceuticals, food processing)
• Energy and utilities
• Water treatment
• Building management systems
• Smart city infrastructure

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4. Recommended Mitigation Strategies

Immediate Actions (Priority 1 - Within 24-48 Hours)

1. Version Upgrade

# Upgrade to patched version immediately
# FUXA v1.2.10 or later

• Action: Update all FUXA instances to version 1.2.10 or higher
• Verification: Confirm version post-upgrade via application interface or package manager

2. Credential Rotation

- Immediately change all InfluxDB administrative credentials
- Update FUXA configuration with new credentials
- Implement strong, unique passwords (minimum 16 characters, complex)
- Consider implementing certificate-based authentication where possible

3. Network Segmentation

- Remove FUXA instances from direct Internet exposure
- Implement firewall rules restricting access to authorized networks only
- Place FUXA and InfluxDB in isolated network segments
- Implement jump hosts/bastion servers for administrative access

4. Access Control Implementation

- Enable authentication on all FUXA interfaces
- Implement role-based access control (RBAC)
- Enforce principle of least privilege
- Deploy multi-factor authentication (MFA) for administrative access

Short-term Actions (Priority 2 - Within 1 Week)

5. Security Monitoring

- Review access logs for suspicious activity patterns:
  * Unusual configuration file access
  * Failed authentication attempts to InfluxDB
  * Unexpected database queries or data exports
  * Access from unfamiliar IP addresses
- Implement SIEM integration for real-time alerting

6. Vulnerability Assessment

- Conduct comprehensive security audit of FUXA deployment
- Scan for other exposed configuration endpoints
- Review web server configurations for information leakage
- Assess InfluxDB security posture independently

7. Incident Response Preparation

- Assume potential compromise if vulnerable version was exposed
- Review InfluxDB access logs for unauthorized connections
- Verify data integrity of historical process data
- Prepare incident response procedures for potential data manipulation

Long-term Strategic Measures (Priority 3 - Ongoing)

8. Defense in Depth

- Implement Web Application Firewall (WAF) with ICS-aware rules
- Deploy intrusion detection/prevention systems (IDS/IPS)
- Establish network traffic monitoring for anomalous patterns
- Implement database activity monitoring (DAM) for InfluxDB

9. Secure Configuration Management

- Store credentials in secure vaults (HashiCorp Vault, Azure Key Vault)
- Implement secrets management solutions
- Encrypt sensitive configuration data at rest
- Regular security configuration reviews

10. Vulnerability Management Program

- Subscribe to FUXA security advisories
- Implement automated vulnerability scanning
- Establish patch management procedures with defined SLAs
- Conduct regular penetration testing of ICS/SCADA environments

11. Security Hardening

- Disable unnecessary services and endpoints
- Implement TLS/SSL for all communications
- Configure secure HTTP headers
- Regular security baseline assessments

Compensating Controls (If Immediate Patching Impossible)

1. Network-level blocking of configuration endpoints
2. Reverse proxy with authentication enforcement
3. IP whitelisting at firewall level
4. Temporary service shutdown if risk is unacceptable
5. Continuous monitoring with automated alerting

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5. Impact on European Cybersecurity Landscape

Regulatory Implications